Things I've tried:
- clearing browser cache
- multiple browsers
- different computer
- run TRUNCATE xf_session_admin
I can contact my sever host, but don't know what to tell them exactly. I saw a post from a couple years ago where someone resolved this with flushing memcache, but I'm not sure how to do that. I just invited a ton of new members to the site who cannot get access to the forums, so panicking, and no idea what to do. Any help would be greatly appreciated!