[cd34]

Try:

Log out, if it gives you a message that logging out wasn't successful, click that.

Clear your cache

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close IE completely (or whichever browser you are using)

Load IE, go to the board, log in, make sure you have remember me checked.

Also, if the date on your computer is more than 9000 seconds ahead of the real time, it could be expiring your session each time.