As the title describes I haven't been able to report anyone in a while, about 1-2 months actually. Thought it was a short term issue but it still persists. It happens with both original posts and replies.
Thanks for the bump on the post! It reminded me about this particular issue.
For anybody experiencing issues, I've isolated the problem. It seems to be related to a 3rd-party filter list called "EasyPrivacy". This seems to be enabled by default on some versions of uBlock/uBlock Origin. For now, the only recommendation I have is to disable that particular filter list. For whatever reason, they are blocking a number of different forum functions (most of which are only accessible to mods anyway).
I'll be reaching out to them to resolve this, but it may take a while. Will first need to figure out just how many things they have blocked.