I was having some probs. with staying logged in on Saturday; it only lasted a short while. I was using MS I.E. 7. When I switched to Netscape 9, no prob.

If you have a different browser (not knowing which you use), you might want to try that and see if it works, then.

Also, go to your User CP (Control Panel) and verify the "Edit Options" you have set. Scroll down to "Private Messaging" and be sure that it is marked "enabled."