Actually I think this may have happened to me when using my school computer the other day. Took two shots for it to actually log me in. Usually I stay permanently logged in on both my PCs though and never have any problems.
Would like to give it a few days to see if things persist but if you do have login issues please post here and describe what happened. Do you have to log in twice consecutively? Does it log you off after having logged in recently, and does it follow a particular action? Is anybody who is always automatically logged in having problems with the system logging you out?
If you're not having problems no need to say so. I will assume the best
Edit: Just added a thread for making tests posts. Those of you that are having difficulties please try it out.
http://altpop.com/stc/forums/viewtopic.php?id=3138