I have been having loads of problems with the decklink 10.6.X series drivers, having a few with 10.5.x series as well. 10.5.4 is rather hit or miss if VMIX can find clock for one or other of my two external outputs (I usually only get one of the two interfaces fail - never the same one). 10.6.x just cant seem to drive either of my decklink outputs (using decklink duo for output). Once they are running they run for ever - but can take 3 or 4 reboots sometimes to get both to come up.

What version drivers is everybody else using?

Keith