10.9.3 and color/colorsync issues
It appears there is a well known color/colorsync issue that third parties have documented with 10.9.3:
http://www.macissues.com/2014/05/21/10-9-3-causing-headaches-for-mac-pro-users/
I suggest if you have such an issue, and are a developer who notice it, to update Apple with the conditions it arises on by submitting a bug report after
signing for a free online developer account: