If he gets too injured, he disappears..... but I've never had him just disappear in either of those locations. I have to say, in all the time I worked on the mod, I've never had happen what you described..... very odd behavior indeed. I don't know what's causing that to happen since I've never had it happen myself. The only thing I can suggest is trying a clean install with a new game, lord knows I've had my installs get hosed and wacky things occur in the game.