No, it didn't. This time it happened earlier in the game and it wasn't even during a leveling up. The only thing in the two events that are the same is that it happened indoors. This time I was in the Den of the Seven Veils and was able to go back inside to see Anomen standing there. When I put my mouse cursor over him his circle was green. I then repeatedly tried to Cntrl-Q him to get him to rejoin my party, but it did not work. And again, the portrait was on my sidebar. Double-clicking did not bring me to him if I was outside the Inn. The right click showed his inaccessible inventory, just as it would appear if I tried to access it if he was stunned or otherwise inaccessible. I finally killed him to get on with my game.
If this keeps happening I'll do another reinstall and keep it smaller. But thru the years I have done the game "properly" and "improperly," abused SK, and other times not. I've never had this happen before no matter how I decided to play. I'm perplexed!