Quote:
Could a reason for this be that I don't think I've ever logged out of the system?


I've never (to my knowledge: I'm not necessarily that observant) seen this problem. I never deliberately log out either and, although I tend to view the board from my desktop, I occasionally use my laptop or someone else's PC

I do occasionally get logged out by cookie expiration (or by a bug in IE -- whichever), but that doesn't seem to cause a problem either.

I check the board with frequencies ranging between 3 times an hour (when I'm bored) to 3 times a day (when I'm busy). I didn't check it this weekend -- I was away.
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-- roger