The rumor I've heard is that he had a pretty big falling out with some members of the team. He was still tight with Haskins, but I think that's about it. Others would probably know more about it than me.
I just think it's odd how UTEP seems to have gone Soviet Union on him. I don't think he was mentioned much or even at all during the 40th anniversary/Glory Road run up. Didn't even get a "he couldn't make it today" today. I wonder if UTEP's going to airbrush him out of the Memorial Gym photo at some point.
To each their own, I guess. But, this is the last time these guys are going to get together. You've got to bury the hatchet at some point.