If your computer has been logged on for a while without any activity on PRC, then you will need to log off the forum, close the browser, then reopen the browser and log back on. I have had something similar a couple of times and it caught me and Gary by suprise. It is part of the safety features of this software. If that is not the problem, try clearing the cookies and logging on fresh again. This should only be a problem if it has been a while since you posted here but left the computer logged onto PRC anyway.