Unexpected forum logouts
The forum occasionally decides that I am not logged in for no particular reason. It may be because it's X days since I last logged in, but since X is not documented and seems to be several days, it looks random.
So we get silly situations like: I load a discussion from the Recent Discussions page, and read the new comments. Because I'm logged in, I am allowed to post, so I type a reply and then press the Post button and it replies "sorry you don't have permission to do that" because it randomly logged me out while I was typing.
I think the forum would be better if it didn't do that. Ideally it should refresh the login time every time I interact with it.