Guys, I desperately need help. Support did the “we will ask a team memeber” and as we all know, that takes 3-4 weeks for them to contact us!!
My preview tab is blank.
My dev public url works 100%, and I can even deploy my app. But the preview tab does not show anything. Agent preview works, but not assistant. Both agent and assistant have tried changing the .replit file extensively. I have tried reverting my .replit and replit.nix to a time when it was 100%. I have tried reverting my entire repo. I have tried a completely new browser, the replit mac app, and incognito tabs. Every view is the same blank. I have even created a new repl, imported my repo, and found the same problem.
This does not occur on any of my other repls.
I have no idea what to do next. There is NO WAY I can suspend dev for 3 weeks until replit support help me.
Hey @chrisbarker3 That sounds bad especially when everything else works except Preview.
Have you tried double-checking stuff that helped us in similar blockades:
- Port Binding: Make sure your app is listening on
0.0.0.0, not localhost or 127.0.0.1. Replit’s preview tab can’t render local-only bindings.
- Check
.replit file: Even if reverted, double-check the run command is pointing to the right server file and includes the port if needed. Something like:
run = "python3 app.py"
Or with Node:
run = "node index.js"
- Preview vs. Webview: Sometimes Replit’s preview tab gets weirdly stuck. Try running it and then manually opening the webview via the generated public URL to confirm the server is up.
If none of that works, feel free to grab a 15-min slot - we’re happy to take a look at the repl structure with you. No pressure, just here to help.
Do you mean that it is a blank white page? Or it is not functioning and shows some other type of Replit error?
Screenshot your preview window here. We’ll figure it out.
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It came right…i created a whole new repl, and tried everything I could to get the original one working, but always a blank preview screen. then a couple of hours later I came back to get you a screenie, and it was working as per normal. Would be interesting to hear if @Hashlogics has had the same thing happen.
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Dev tools console is your friend for this white screen issue. It usually presents itself there.
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Thanks for that guidance and offer.
I ‘solved’ it at the cost of half a day (cos nothing worked right first time):
- Created new blank repl off a template
- Pulled my repo
- installed package and python requirements
- created new db
- filled db with a pg_dump of original db
- And that gave me a working preview again.
- Still need to deploy to my domains which involves TXT and CNAME record updateds, and a delay
Interestingly, .replit and replit.nix and /.config all made no difference. Culprit is likely a setting somewhere in replit that we don’t get to see. I also got to play carefully with the ports (network tab) between the 2 repls, and there was nothing I could do to get the original repl working. I have left it smoking beside the road.
I now have a new issue: My repl often will not “stop” (the sotp button). So I cannot ‘rerun code to see changes’, I cannot even open a shell, and i can’t even ctrl-C in console. ONLY solution is to click replit home button, then go back into the repl. Everything I read up says app is causing replit back end to hang, but I have no memory leaks, and why would this suddenly happen?
Have you checked dev tools console?
@realfunnyeric please explain further: I have the app console of course, but I can’t find any other console tab in replit. Is there a tab that gives me a view of what’s happening behind the scenes?
There’s a wrench icon in your preview window that will open up browser console. Infinitely useful for debugging issues. Copy errors. Paste in agent. Ask for help!
Thanks. I have been using F12 a lot to pick up issues, but haven’t paid much attention to this wrench panel. Will use it more 
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