True, the anecdotal evidence seems to be limited to certain hardware. Overall though, this is a huge blow to the users that it effects because it makes Photoshop almost impossible to use in a production environment.

Given that there's a finite range of Apple hardware that Snow Leopard is even compatible with, one would think that testing for repeatable bugs like this would have started months ago--and finished before Adobe signed off on CS4 for use with Snow Leopard.