I have the exactly same problem. I recently change my monitor connected to the Macbook and now is so dark. I "calibrate" it but is the same.
However when the Mac startup it show colors fine by 1 or 3 seconds... and then the dark colors come.
I want to reset the color profiles but is impossible!
I just tried HardDrive/Library/ColorSync/Profiles/Displays to delete a display profile that I couldn't previously and it worked. I think the problem was that when I created the profile, I clicked the box that said "Allow other users to use this calibration." Clicking that box seems to lock the profile; the only way to delete it is to use the path above. So, if you don't need to reproduce the display profile for another user of your computer, make sure that this box is not checked. Thank you, ashslaveDT.
I created a few color profiles for my macbook using the calibration tool. I have one that I like but can't delete the others that I created. When I select them, the delete button remains greyed-out. Any ideas?