I posted a message, got a reply, and would like to reply to that thread, but I can't. I log in, but every time I click on the Subject of my thread, I get logged out. I've tried logging in 6 times. All logins are successful, but when I click on my thread I'm called guest again. I even tried clicking the login option of staying logged in all the time, but that made no difference.

I must be doing something wrong. This is too big a problem to be like this very long.