Quote Originally Posted by rbrigham
My G5 lockup was a conflict between the Blackmagic Decklink Extreme driver and the OSX version. Originally thought it was a hardware failure of the capture card. Updated software, system is unstopable.

Thanks to Richard and HES.

-Bob Brigham
make sure you have turned off the decklink video desktop as well.
this is in the system preferences->Decklink.

this affects the performance of catalyst.