I'm having two issues, with my boards. The first is that users click on one thread that was unread and upon returning to the forum, all threads are shown as read.
The second issue has to do with getting the message, "This form is not valid" when trying to post. It happens whether they use the Quick Reply, Quote, or regular post form. I already tried setting session.gc_maxlifetime to 999999 in the php.ini, but that seems to have only made it worse. That doesn't make a lot of sense either as I'm using cookies rather than sessions.