runtime error going to bind pose on PLE 5
 

I have lots of IK set up. I've tried setting all joint rotation axes to zero, detaching the skin, etc. Clearly, I've done something to get the model into a state where, after selecting the root joint of the skeleton, it doesn't like something about the model and Maya's reaction to going to the bind pose is violent: a runtime error announcement letting me know that the application has requested the Runtime to terminate it in an unusual way. And then it dies.

Any ideas on what I might have done?