Users are reporting an issue with Photoshop CS2 9.0.1 where color becomes distorted on printed images.
A posting to Computer Darkroom reads:
"This problem, when it occurs, is most noticeable as banding or posterisation within a very small range of tones/colors, which typically include skin tones, the transition between yellow/orange, and some reds. It's further complicated by the fact that the affected colors seem to differ by printer model and media type."
According to Adobe, the actual cause of the problem is due bug within Mac OSX 10.4.x that had been hot-fixed by Apple for Photoshop 9.0 (AKA CS2), but was broken again with Photoshop CS2 9.01 testing net.
In the meantime, users can either revert to Photoshop CS2 9.0, or follow the workaround posted to Computer Darkroom.