For the record, I love BlackMagic hardware products. The MiniRecorder, the HD-SDI Router, and the converters are all great products. The only problem is the software. I've had an unbelievable amount of troubles with the software they offer. I've had Blue Screens of Death, random crashes, and whenever I try to play an mp4 in Media Express, it crashes.
My advice? Stay with whatever version is working for you, and avoid being an early adopter of their software updates, especially not before a show.