GPT-4 does not reply

I enter a prompt as normal and nothing happens, since this morning 12-9
I find no notice of any issues anywhere.
If I go back to 3.5 I get a reply to my prompt as usual.
(Is there even a support link anywhere for this kind of stuff?)

Sorry to hear that you are experiencing issues. It is still working fine here. The problem could be related to a local network issue. Some users have reported problems with ChatGPT and VPN or solutions like NordVPN Web Protection.

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