Same problem here. Anyone solved it?
This is happening again. Whole day unable to login
Same problem here. Some alternative?
Here It’s working again . 
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Still getting the same error, have tested on 3x different browsers…
Have tried fixing DNS issues & clearing cache/cookies, no luck.
Being not logged in using the free chat prevents the error, but has limited functionality compared to the paid plan.
edit: even though the error still appears, ChatGPT seems to be operating as normal (~12 hours after first experiencing the bug)
I have the same problem. Today I bought Chat GPT 4 and after a few hours there was an error in the console: Access to script at 'https://cdn.oaistatic.com/_next/static/chunks/sso.311a6edc30b74ebd.js?dpl=ec54f87…' from origin 'https://chatgpt.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
When will this be fixed? What did I pay money for? I see I’m not the only one with this problem. Do developers even read threads?
I resolved this problem! Need to allow third-party cookie in chrome browser settings and add chat site as an exception. The Cors error still remains, but you can use the chat
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I have a temporary solution. this bug happens only on wide screen, but if you shrink the window down to a certain width and reload the page, you can use the web version without issue.
Left (wide screen)
Right (small screen)
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Hi everyone,
For me it wasn’t related to the wide screen, and I have managed to fix it by going to Settings / Security and using Log out from all devices and a brand new Multi-factor authentication setup. After refresh my chat started working again!
I hope it will help someone
it doesn’t work for me … what a shame
ladies and gentlemen you guys are all stuck within this malicious chrome framework.
It is a webkit that impacts all your browsers.
Only way to get around this is to setup a tunnel directly to a proxy server.
Access to script at ‘… cdn . oaistatic . com _next static chunks sso.b252a82de34c9945.js’ from origin ‘… chatgpt . com’ has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.
The root issue may be here:
…cdn.oaistatic.com _next static chunks sso.b252a82de34c9945.js
because it does NOT exists at all 404
If you need any help with repro or debugging - feel free to contact me - I am software engineer and I can really try to help (not resizing my window).
Hi Demitri
Do you have a contact number?
Thanks
Hi Mike?
First of all who is “Demitri”?
Why do you need my “contact” number?
Hope you mean “telephone” not SSN or bank account 
?
And what do you need my contact number for?
And could please introduce yourself first since you are starting conversation.
Yours
Dmitry / “Leo”
Hi Dmitri
I thought you were from the actual chatgpt team.
Lol whatsapp, or perhaps telegram number.
As soon as i sent sanitised Hars file to chatgpt team they stopped responding.
I got more info in regards to the CORS policy, if you are well versed in software engineering perhaps you can assist.
My name is Mike
Im from Australia
Hello, I need help. ChatGPT has erased data from a presonal file on my dt!
I uploaded a .csv file to OpenAI/ChatGPT and asked it to run some simple analysis. The file was closed and saved on my desktop.
ChatGPT said the file was too hard to understand. I therefore opened the file (from my desktop) and created a simplified dataset (a subset of the original), in a separate tab of the same document. I closed the file, saved on my dt again, and re-uploaded to ChatGPT. ChatGPT then said they couldn’t do it because I had reached my max usage for the day (strange, since it was my first request) …
Anyway, I THEN closed ChatGPT and went back to the file, planning to analyzed it myself. However the ORIGINAL DATA (the complicated dataset) was COMPLETELY GONE. And the “simple” tab I created was there, but all of my formatting was lost (in this particular case, a bit of a disaster).
… The fact that my original datset is GONE is a huge problem. There is only one tab in the workbook now, not two. And the original data, again, is GONE. I queried ChatGPT and it said it was sorry I was frustrated but … nothing … HELP! How do get my data back? How can I make sure this NEVER happens again (aside from just never using ChatGPT)?
I did as you said, but unfortunately the problem still exists.
So i have the issue where when logged in or out, chat doesnt work at all. When i hit enter i get nothing. So I switch to incognito and it works just fine. Still CORS issue but the app is working as expected.