When running the most recent mac client for COH I noticed the gamma setting of the game would automatically set itself to the lowest setting which rendered the game unplayable. I could reset it by adjusting the gamma setting in the video settings, but it would eventually become unplayable again.
I am running the software, f.lux (
http://www.stereopsis.com/flux/), which adjusts the lighting of the lighting of the monitor to match the light of the room you're in at any given time. When I disabled f.lux COH would no longer mess up its gamma settings. It's not a major issue... but it is kind of annoying to remember to disable f.lux when I want to play COH -- this issue does not happen in any other MMO I play on my mac (WoW, for example).
Thank you!
~Eric