Thanks. To be sure it seems to be an intermittent problem making it hard to predict when it'll happen. I'd say it happens to me about 30% of the time and it seems uncorrelated w/screen/keyboard activity, i.e. I'm editing away and it's only when I attempt to post (so I'm like now you tell me?) that I get the you've been logged off message. A related issue is that when you are logged off and you log back in you get a blank/empty/absolutely useless screen.