I'd give compiling a shot too. I think the PS bin is linked against cg1.5 so dropping in the newer version might not have mattered if the new driver was looking for something not offered in the 1.5 cg lib. I'd try compiling with cg 1.5 first, and if that doesn't work try recompiling it all with the 2.0 cg library. If the issue is the same there on both compiles then likely the issue is a driver bug.