CS4 Crashes when copying effects

Question

Every once in a while, AE CS4 crashes when I attempt to copy one or more effects from a composition. It's unpredictable, it works fine 10-20 times, then crashes. It happens whether I use the keyboard shortcut or the edit menu. It's happened 15 times in the last few days (I'm color grading a feature film), and despite my best efforts, I've found no solution to this rather annoying problem. Fortunately I haven't lost any progress, as it successfully saves during crash, but the long time it takes to reopen the project is seriously slowing down my work, and I have a deadline approaching fast.
CS4 Master Collection
Windows 7 Home Edition x64
12GB ram
Core i7 980x Extreme
An error message appears, I think it usually says something about ae.blitpipe being the last thing sent. I've tried it in numerous compatibility modes, some seem to work better than others, but they all eventually crash.
Let me know what additional information you need to help me work through this problem, it's making my job very frustrating.

Answer 1

The usual combination is:
Halsubalance (Pixel Bender)
HDR Highlight Compression
Linear_Vignette (Pixel Bender)
Curves
Hue/Saturation
However the crash has also happened when copying just one or a subset of these filters.
Color space: 16bpc, HDTV (Rec.709)
I've considered the Animation Preset route, but with the number of scenes/shots in the project and the frequent changes I have to make, it seems like it would quickly become very unwieldy. I may go that route regardless if there is no other option, but I would really like to fix the copy/paste situation.