IPhoto crashing during edit with SL/GMA950

Question

Since upgrading a MacBook2,1 (Core 2 Duo, GMA950) to SL/iPhoto 09 it consistently has problems while performing almost any image adjustments in full screen edit mode; hanging, showing large bars of vertical 'noise' and sometimes leaving the screen blank forcing a restart. Each time this happens there is the same 'problem' reported in the logs:
[0x0-0xf00f].com.apple.iPhoto[124] CoreImage: CIGaussianReduction4: fragment program failed to compile
[0x0-0xf00f].com.apple.iPhoto[124] CoreImage: CIGaussianReduction4: falling back to software
[0x0-0xf00f].com.apple.iPhoto[124] CoreImage: CIGaussianReduction4: fragment program failed to compile
[0x0-0xf00f].com.apple.iPhoto[124] CoreImage: CIGaussianReduction4: falling back to software
My understanding is that this is referring to the interface between CoreImage and the 'GPU' where LLVM tries to determine on the fly whether to use the GPU or emulate the OpenGL functions in software. The fact that it can't compile is odd, the only thing that I can think of is that maybe there is a JIT cache somewhere that is corrupted but I have no idea how that can be reset.
Anyone any ideas on this? Anyone else seen this (which is making iPhoto a bit unusable)?
I have tried the obvious already
1) SMC reset, PRAM reset
2) Reinstalled iPhoto & SL & rebuilt iPhoto library/thumbnails
3) Deleted the user/Library/Cache directory
Thanks in advance

Answer 1

Upgrading to iLife 11 (iPhoto 9.0) appears to have resolved the problem. It makes much heavier use of GPU acceleration so presumably the code in this area has been changed.
It's not a bad upgrade even if it is only UI changes though beware there are issues upgrading iPhoto 8 databases (make sure everything is backup up and they have been updated to the very latest version of iPhoto 8 before upgrading to 9.0). 1 out of of my databases would not update.