So I take snap shots while Im colour grading. Ive been using Colorista II a lot lately and anytime I use the snap shot feature AE hangs. It's fine when I initially take the shot. The problem happens when I review the snap shot. I only mention Colorista just incase there is a known bug but it happens without it too. Running CS5 on a MacPro 2.8 (8 core) Latest software versions of everything.
Thanks for your time.
Turn off the "Accelerate ... panels" option in the prefs.