the problem i think is to do with 10.5.5, when i was using Leo4All 10.5.5 it wouldnt work for me, and crashed also at the same time as you indicate, i manually patched my OS to 10.5.5 and it sounds like you have as well, so there must be something wrong with the AMD Patched Updates that causes Photoshop CS4 to crash, when i went back to 10.5.2 it all worked fine.

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iMac ::: Mac OS X 10.6.1 ::: Intel Core2Duo 2.93GHz ::: NVIDIA Geforce GT 120 256MB ::: 4GB DDR3 RAM

Milanca Project ::: Mac OS X 10.6.1 Retail ::: Vanilla Kernel ::: Intel Core2Quad Q6600 2.4GHz ::: NVIDIA GeForce 8600 GT 256MB ::: 4GB DDR2 RAM ::: GIGABYTE GA-EP35C-DS3R