Yes we are having the same problem. No comments can be posted, no docs can be uploaded. the red banner appears at the top.
Getting Red Banner here too. I have seen this before and there are other threads from the past outlining the same issue.
In a web browser the red banner appears on most actions and appears to fail - for example adding a new task appears to fail but clicking away into another project and back again will show the new task.
Posting new comments - they do not appear in browser but do show up on android app.
Android App gives error code 500 when posting new comments - and fails.
Plus new users are not receiving emails to activate account - might be a separate issue with a blocklist.
Same problem here. We use Producteev from browser interface (firefox). Impossible to do anything at all, a red banner pops up at the top of the screen.
It has been going on for two days. It is pretty bad.