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.

It could also be a conflict with another browser extension for ChatGPT:

Please share more details, including a screenshot and screen recording. Make sure the browser’s developer console is visible, along with any errors. You can either share them here or send them to our support team at hello@aiprm.com.