I just got a new retina MBP, running Mountain Lion 10.8.5, and it wont recognize my UltraStudio Mini Monitor connected via thunderbolt. I installed the latest blackmagic drivers (9.7.8) and have the latest thunderbolt drivers as well (1.2). I had the Mini Monitor running perfectly on my old MBP on Lion 10.7.4. with the Blackmagic 9.7.7 drivers.
The little light on the UltraStudio Mini Monitor does not illumiate when I plug it in and the system profiler sees nothing connected via thunderbolt.
Ive tried uninstalling the BM drivers and installing older versions with no luck.