I'm running it in XP SP2. As mentioned, the problem is so rare that I had more or less forgotten about it. As soon as it happened I thought it was a graphic or animation loading hiccup, which happens from time to time. After 1.2 seconds, I knew I was dead. I had lost a character like this before, but it was a different decade, computer, and character.
So, if nobody is horribly upset by the capricious manner in which I treated my ESU character, I wouldn't mind piggy-backing through Norm Diablo, some norm Baals (nd then most of NM) early Monday evening.