This has been on the known issues list for ages. Cider apparently has its own colorsync profile.
Manga @ Triumph
"Meanwhile In The Halls Of Titan"...Titan Network Working To Save City Of Heroes
Save Paragon City! Efforts Coordination
Known issue still, any way to fix it?
This kind of thing has been an issue with pretty much every game I've ever played on a Mac, at least the ones that have an option to switch between "full screen" and "windowed" modes. I'm fairly certain it's a gamma issue - the game uses its own gamma setting when playing "full screen", but in "windowed" mode it switches to your Mac's default gamma setting.
When i run City of Heroes in windowed mode the screen will have a blue tint, when i click on another application it turns to the normal colors. When i click back the screen goes back to a blue tint, its really weird.