camera profiles are either sRGB or Adobe RGB 1998. The laptop was calibrated using a Huey profile. I only PM to view images direct from the camera.
So you're saying that all you need to do is open up a contact sheet full of photos, wait for it to load, put your laptop to sleep, wake it up, and then PM completely re-renders all of the thumbnails in the contact sheet but with a different color profile? Waking from sleep should cause no re-rendering whatsoever. Do you see the thumbnail names change from black to red and then black again? If so, then PM is re-rendering the thumbnails. If not, then PM may be re-drawing them, but Apple's ColorSync would be at fault if the color changes.
I have never seen this issue personally. Perhaps you could post some before and after screenshots as JPEGs to your reply to this message? Use the 'Additional Options...' link when you're composing your email and there you can upload JPEG screenshots.
-Kirk