I have a *beep* web host, so am unsure whether or not this is a bug - can any replicate it?
I have just deleted a user group, which had 32 members (none of which had this group as their default usergroup - all they were in it for was to be able to view a particular forum, which no longer exists). When I went back onto the board's index page, the forum says "this board has not forums" - but they're all in the ACP with the relevant permissions.
So I restored the database and tried again, to no avail.
So I restored the database again and noticed the exact same thing happened after restoring my permission after I had tested out another users'

Scary canary - any ideas?