Rhino Lockup

I have had the following problem occur with sufficient regularity that I am convinced it is a bug. That is,

  1. Rhino locks up and becomes completely unresponsive.
  2. I can do to switch applications but all the other applications are unresponsive as well.
  3. Have to do a hard shutdown and reboot to correct.

It only happens while running rhino but seems to occur without regard to any other application running.

Any ideas on how to diagnose?