I've been having issues with the system keeping me logged in. I log in, click on a thread I want to post a comment on and it turns out I've been logged out. I log in again, it takes me back to the main page as logged in and when I click for a thread again, I'm logged out. Sometimes I can't post anything, because of it. My few comments were posted during these short periods, when the system keeps me logged in.
I think Annie and Morgana said it was Internet Explorer problem. Have you tried a different browser?
VirginiaR. "On the long road, take small steps." -- Jor-el, "The Foundling" --- "clearly there is a lack of understanding between those two... he speaks Lunkheadanian and she Stubbornanian" -- chelo.
