I just discovered I was missing options - Layer options - while watching a Matt K. (Kelby Training video on using CS5 for compositing). I reinstalled the product, and had to rebuild default cs5 settings after my reinstall - this wiped out my newly reinstalled layer options off my cd. So I reinstalled again, and this time was missing different options. Rebuilding defaults for users running an UPDATED version of LION is doing goofy things to CD5!