Just upgraded my 2011 MBP to 10.8.3 (combo updater), and having a weird problem: whenever the system switches from integrated to dedicated GPU, the color shifts significantly (I'm using a hardware-calibrated profile, and the color goes extremely cool). It's not that it's switching profiles on me; the pref pane and ColorSync Utility both show the correct profile selected, and if (while on the dedicated GPU) I switch profiles, they all look funky--very, very cool. It does appear to be responding slightly to different profiles, so it's not just stuck on the wrong profile, either. Trying a quick manual calibration with the GPU running produced a semi-workable profile, but as soon as it switches back to integrated graphics that profile is so far out of whack the screen is almost unviewable. Did a "verify profile" with ColorSync Utility, which did show a bunch of minor errors (none of which had been a problem under 10.8.2 or any previous OS), but doing a Repair fixed all of them, and didn't help. I'm assuming nobody else is seeing this, or there would be a bunch of complaints--but it has to be a software issue, since everything was fine an hour ago. Any suggestions about what I should mess with?