This gives you an idea of the complexity of the model. Sometimes the only way I can find parts is to go into Wireframe mode, then use Isolate to work on them, but I was not working in Isolate tonight when these several crashes and errors occured. It was mostly in renaming parts and setting animations, and crashes occurred in 'selecting parts' in the scene, in Wireframe mode.

My apologies, you might wish to have this part in there;