Okay, so I recently encountered an issue where the site says your logged in (this site) but you can't post or do anything else until you log out, but it won't let you do that either. I found an easy fix for this. Just clear your browser cache (I think log in data would do). I don't know if anyone else is having the same issue, but I thought I'd post something about it, just in case.
btw is this where this sort of topic should go?