At one point this morning after pingponging between a coupla very strange (even stranger than Mudcat) websites, I started getting security messages and then when I tried to get back to Mudcat I got a "Server not found" message several times, then, I think, on ragtime, too. Came up with yet another problem, crashed (or rather locked up), rebooted and everything has been hunky dory since. I think the computer was just confused. (Probably because of of a RealAudio file saying "I am a machine vastly superior to humans." Uh huh -- I TOLD you I was at some weird sites!)
Haven't had any problems since -- other than not getting any responses to PMs I've sent the past coupla days.