Hey there, have you copy and pasted that image into the chat and asked what is causing this?

Maybe you, through work started an AUTH which requires log in to view? If this is the case, sometimes you will only see the landing page – somethings, nothing, or maybe refresh? If you have A LOT going on in the background it may require a refresh. First try to copy and paste that image and see what chat says

”do I have some AUTH setup that is not allowing me to view the current preview, or is this something else?

Best,

J

Are you still experiencing this issue?

Having exactly the same issue, the new interface broke everything for me and is downright unusable at this moment. How can we revert back to the well oiled machine that the previous interface was?

Sorry that you're seeing this folks! Can you share chat links with us? In the meantime, does duplicating chats help?

same problem here the project start but I cant see the project page and the chat.

It’s really frustrating. I’ve been previewing an app fine, and then all of a sudden I get the dreaded message:

Please fix this ASAP! I know I can preview fine. If you want to add a warning, fine. But don’t make me open a new window and all that. It messes with my flow (and ability to edit the code because editing code is not an option when you have to do the new window preview).

I flagged this internally. Thank you!

I have been working on my project with v0 for over a month now and it was a breeze until yesterday.

Problem

Not sure what happened there, but suddenly the embedded preview stopped working and the whole workflow fell apart. The reason stated by v0 is:

Found authentication libraries used in the generated code, which might not work as expected in the embedded preview due to browser restrictions. To see the preview, open in a new tab.

Current Behavior

• It all worked just fine in past branches (and still works if I reopen their chats).
• Any new branch I’m trying to create now has sudden issues with it, even though no code has changed in between.
• Example chat: https://v0.app/chat/aevelcz-lasertag-gg-OK10lV5IPV9
• Was working up until here: https://v0.app/chat/tournament-edits-and-templates-aG9124YEGhi (now suddenly isn’t working anymore as well)

Impact

The separate tab preview mode is significantly less effective for my workflow:

• It keeps breaking things.
• It fails on simple tasks that previously worked in the embedded form.
• It misses the critical Fix for free with v0 buttons that offloaded some of the burden when v0 was acting up.

What can I do to go back to the original workflow?

That said, it’s also totally possible this is just an internal or transient issue on v0’s side, in which case feel free to disregard everything above. I mainly wanted to share what I’ve personally run into and a few workflow tips that helped me stay confident things were still working as expected.

Because, I promise, when I say I panicked - I PANICKED L O L

Someone was talking to me, -me as I sweat with dread & fear- “I’m sorry I can’t talk right now”

Good luck and happy building my friend!

-J

they should just change back to the original, where users can push and pull from github manually. The new update is trying to make everything auto sync however normal users cannot bear with constant interface change! this is just a pain in the a**.

and i just do not get why they think reordering the folder is any helpful. We want to explore V0 by having chats under project and clear Github integration. What’s worse is when duplicate a new “branch” it created another branch of git instead updating to the designated one. GOD this is so unhelpful

What is the pain point for you in the automatic workflow? I'm trying to understand to flag better to the v0 team

What isn't clear?

I’m experiencing the same preview issues. It’s frustrating and currently blocks my workflow.

also:

• the new DB tab also isn’t connecting, and the error is unclear: “Failed to load schema. No database URL found in integration environment variables. Available keys: SUPABASE_SERVICE_ROLE_KEY.” It’s not obvious what’s missing or how to fix it.
• branching is also confusing: changes made (not pushed) are showing up when creating a new branch from an earlier version (v1).

I understand branching is the right long-term approach for production apps, but the rollout feels rough.

a temporary flag to disable the beta would help. Without preview, design changes aren’t usable, and constantly opening preview in a new tab isn’t practical.

It sounds like you don't have a database URL in environment variables - have you checked that?

When you create a new branch from an earlier version, it brings the context of that branch. What is confusing?

Appreciate this feedback!

Got this error, when i publish it need to pull request before to publish. Link chat here: https://v0.app/chat/guest-sign-in-form-hcClZfTB61L

Error: Browser Restriction Detected

Hey ryanb-hamedia! Great to see you here. To help you out with the "Browser Restriction Detected" issue, could you share a bit more information? Specifically, what browser are you using, any error messages you're seeing, and if this happens on all devices or just specific ones. Thanks! 😊

Im using just google chrome.

Before im seeing the preview before it go to live. right now it required to open new tab

I already added the database URL as SUPABASE_URL, but it’s not clear which variable I should use.

This is probably a bug: when I try to start a new chat from an earlier version, it creates a new chat that includes all the changes I made after that version. In this case, using v1 still includes all later changes in the new chat.

The same issue has recently affected all projects that received the last update, wasting time and tokens. No matter what I try, I keep getting this consistent error in both PREVIEW AND LIVE DEPLOYED PROJECTS: Browser Restriction Detected. It finds authentication libraries in the generated code that might not work as expected in the embedded preview due to browser restrictions. To view the preview, open it in a new tab. None of the solutions I tried have worked.

I simply can’t ship.

Since the beta rolled out, my build productivity has dropped to 5% due to:

• Preview doesn’t work
• new git, while promising, is buggy and dramatically reduces shipping speed. e.g. how can i manually change code and then visit preview? i don’t think it’s possible anymore.

Thanks for the info @ryanb-hamedia! I’ll raise this with the team.

Hey team,

I’m seeing some heavy friction in the latest v0 iteration. I use this tool to ship at high velocity, but a few core infra issues are currently killing the "flow state":

1. Preview (Still Broken): The preview is failing to initialize even on fresh projects (ruling out auth/session lag). It’s making the "prompt-to-view" loop impossible. No design mode.

   

2. No Manual Preview Build: We need a manual "Build Preview" trigger—just like we had. Currently, there’s no way to sync manual code tweaks without opening a PR and then asking the AI to "re-edit" the file just to trigger a build. It’s a massive time tax.

3. Unreliable Checkpoints: Forking or starting from a specific checkpoint is currently non-deterministic. I’m seeing leaks where changes from later checkpoints bleed into earlier ones. Last week, I had to drop into a Git Desktop terminal just to perform a clean rollback. That’s the antithesis of the smooth, "it just works" experience v0 is known for.

Love the tool, but the infra is making it super hard to ship. Any updates on a fix?

I am having this same issue and the same error message. It seems to having authentication issues with the database.

Can you share a chat link? Thank you!

Flagged to the team!

There are so many issues with the latest V0 update that messed up my current prototype build, and I am at a stopping point. I copied the chat or even created a new chat and copied my repo, but still seeing the issue. I prefer the previous V0. Can I downgrade?

I might use switch to Base44 to continue working on my prototype

Same issues that everyone else is seeing

Sorry to hear this, Andrew. I've shared it with the team!

If you have chat links handy that would be fantastic.

Fire your product management team, whoever making users life complicated. All these latest releases are useless and I may move to other platforms with all my 18 projects. First Git branching and now this stupid error.

Browser Restriction Detected

Found authentication libraries used in the generated code, which might not work as expected in the embedded preview due to browser restrictions. To see the preview, open in a new tab.

As you can see ladies and gentlemen, this is the result of pressurised incentive to push out “game-changing” updates without thorough testing which results in a complete breakage for every single loyal and paying customers, completely diminishing ease of use, stability-and driving customers away from this platform.

Please fix this, it’s been weeks now. I’m having to use Codex in the mean time, whilst V0 is still charging me-for credits which I can’t use in any manner which is suitable.

When you open in a new tab, are you still seeing this?

How is v0 charging you credits when you're not using it?

Re-read what I stated, I said I’m still being charged for credits which I can’t use. Credits are included in the subscription, I’m being charged for a subscription which is currently unusable in the current state of V0. That is my point. Hope it’s fixed soon. As long as the credits are rolled over I don’t mind, I’m currently using Opus 4.6 and Codex with VS studio in the mean time.

Heard, shared with the team :)

Thanks!

I wouldn’t suggest this. You’ll burn through credits and the issue will persist

Yes, we are still getting this dreaded error.

Obviously it wouldn’t show in a new tab preview, but as mentioned above, that is not a usable workaround:

• the experience is cumbersome that way
• the “Fix for free with v0” doesn’t show up when v0 creates app-breaking errors
• we cannot use the design mode
• etc., etc.

Interestingly enough, the exact chat somehow randomly launched the embedded preview after a refresh ONCE today (so it can actually run!), but fails to do so constantly otherwise.

It’s been two weeks since the last update and introduction of this horrible new builder experience-breaking workflow, which happened without any warning whatsoever and we still don’t have a fix for it. Why did you have to break a perfectly working smooth product and WHEN are we getting the much needed fix?

The v0 team shipped fixes yesterday, and are continuing to. Appreciate your patience!

@pawlean I suspect this is a Supabase-related issue, as it happens EVEN on new projects/chats. Here’s a new chat where it occurs. All my current and future projects are on Supabase.

Whenever using auth in your projects you will be asked to open a new tab to be 100% sure that the auth works the way you want it to work. The team is working on getting the designfeature working again in these cases and i hope they will also fix the logging/fix for free options within this new tab. but nothing we can really do about it for now.

interestingly, it works properly on the v0 iOS app

Previews are rarely working here. Why? I took a week off from V0 but previews were working in late Jan before I left. Now I can basically only see app when published. The preview has worked a few times (maybe 10-20%?) on new apps but I just gave up building after it kept failing. Can’t pin down what makes it fail/succeed.

We can’t seriously have to publish our app for every iteration just to check edits…..

This is unusable…..

What’s status?

Hi I posted the original post, after discussing with V0 support engineer I learned this is meant to happen and not a bug with the new visual studio code preview and authentication library detection.

Here is everything I lost since I have to now open a new tab:

1. Log dated is not easily accessible by the V0 chat, my development speed has gone down due to this, and from a V0 business perspective, my usage of V0 credits has also gone down.
2. Major hallucinations now, I think because of the lack of more data that is lost, since I am in a new tab, the output is just bad. Going directly to Claude has been way better
3. More user behavior:

• The constant need to open a new tab to test (to be honest, I didn’t care if I had to sign in every time to test my app)
• Dragging images and files in the new tab chat box is not that great, I have to constantly click the + but normally I just drag and drop things in when I had the chat + preview

Ideal path:

• V0 can open my new builds (with authentication still active)
• V0 can see my log data and V0 can use the logs to test and add better reasoning

Next steps:

• I have slowly been migrating to Claude code now (I still love V0 but until this is fixed and previews can be used again, I have no choice but to find other tools)

Feel free to reach out, I want V0 to be my ideal spot, but right now I am not happy with the new updates (other than github branches, that has been AWESOME! If I have another dev branch off of me) but everything that has caused made the whole app not as usable as before. I am sure majority of users are individuals, but I am assuming enterprise customers needed that feature, so makes sense. But solo devs, def can feel the burn it seems from the other post I saw here in the community threads.

Same issue here, had been working for a week in the otherwise excellent UI, with chat on the left and preview on the right, but after I did a PR to wrap the day, V0 instructed me to start fresh with a new branch & new chat the next day. I went ahead, tested, and ran into the dreaded “Browser Restriction Detected” and it’s a complete workflow disaster. Please fix your awesome UI!

When I go to the existing chat, everything is gone. No preview, no code editor, No env config, No git. Only chat

This is very critical. I can’t even change env variable without wasting credit.

I can’t test code without having to deploy to the production

Agreed… i do know that the v0 team is working overtime to get this all working smooth again! Hang on.

Got preview working on an in-progress project. No idea how. Started new project, preview doesn’t work.

Guys without a preview V0 is entirely unusable. Just revert the update.

Well we are “hanging on” for almost a month now since that disaster struck. Workflow ruined, apps can’t be reasonably developed due to everything @devin-6075 mentioned above.

I think I haven’t ever seen a more disastrous out-of-nowhere product update before and I have seen some pretty messed up things. v0 is not some B2C mass-market website guys, it was a fantastic productivity-boosting engine for a lot of people willing to pour in money for what it offered. And you managed to just bring it all down to near-useless form in one update nobody asked for. We really should at least have an option to rollback to previous non-beta approach or to check that we are okay with the auth possibly misbehaving (it never did) for the quick iteration process. We can always check the final state of things at the end using the proposed preview tab.

Well i can agree that the auth always worked the way you wanted to work in the old version within the preview, and indeed the new flow makes coding stuff allot slower, 1 thing i personally dont like is the fact you cant copy paste images or just slide images into the chat pop up that also opens when opening a tab. that way i need to save screenshots by hand and then select them with the +. Really slows down the process. But i am 100% sure that the team heard about all our feedback and issues and will come with a fix soon. Last week they already shipped some improvements, lets hope this also gets resolved soon.

Also experiencing this in a brand new project so its even related to legacy projects in the new update

here is a broken one for you https://v0.app/chat/kdawgwilk-baker-haven-hj-jRMKhOtIWLB

Can you unlist it?

I am having the same issues. I can’t do anything and since things are broken I can’t get v0 to fix its mistakes.

I can’t send the chat link because it has API keys.

My preview environment is just black screen nothing is there.

Oh wow! A ton more people have entered the chat! Hopefully we will hear back soon.

You all must be power users haha probably:

• using supabase for auth
• using stripe
• a ton of new releases going out daily/weekly

Absolutely! It is crazy how many people rely on this stuff, and how threatening it can be to have it go down!

OP here, I have posted on X last week and Guillermo sent his team, so I say we hold on until we get an update! https://x.com/toolandtea/status/2021658971501912185?s=20

Y’all can follow me here too on X haha @toolandtea 😂

Appreciate your patience everyone! The team are actively improving this experience

Just so you know for the future, chatlinks are always prive and will not expose any data about your project. Data only gets exposed to people that you gave direct acces to or the v0 team itself

Cheers

• MarnixB

Shoutout you.

Thanks for the X post urgency, it really is as you’ve mentioned. The unsettling current state of things made me to go out of my way and sign up for Claude Code already to try it out. As much as I’d hate to make the switch, because I really loved the previous v0 workflow effectivity, if these things don’t get fixed quickly, the move might be final. I really hope the team will pop up with some solution fast.

Seeing the same blank v0 preview pane issue tied to auth iframe/CSP behavior in sandbox. A mitigation that helped: add a dedicated sandbox flag (V0_SANDBOX=true) in Development only, then bypass/stub auth only when that flag is on. Keep Preview/Production unchanged with normal auth enabled. In practice, this worked best when covering client imports + server imports + Edge middleware (sandbox no-op, non-sandbox real auth). Not a universal fix, but it can isolate sandbox rendering issues without affecting normal environments.

we’re seeing same issue; cant do forks,/duplocates; cant see preview; i keep getting false errors in console on eveyr new fork - but in foudnation base branch all is good, both preview and website;

ALSO, it has been 2 weeks since i crreated ticket [ you can see it in our account] we did not received promied referal 20USD. second party that joined veercel did. it is not ok to treat like that people that recommend you @pawlean best regards

Hey, @aicom! I'm sorry you've had this experience.

Can you share a chat link with me?