If the center x of your hammer window is illuminated red, you have an enity in need of an origin brush--func_door_rotating, func_tracktrain, etc.
What center x? I don't see center x.Yeah Muzzie, you're right--I just tested it and there is no center x... I have no idea what I was thinking. Actually, I think I had a weird phantom brush appearing, caused from collpasting vertieces until there were none left...yikes--this isn't modeling rowleybob! I think I ended up fixing it by opening entiy report and deleting.
Misinforation alert!