We were runing that exact set up in NTSC with 4 gigs of ram. There was a conflict with the BM drivers and some Motion effects. The solution was to turn off the BM desktop. Also you may have to feed the deck a sync signal. Either use a Black burst generator or have the BM card generate black and feed that to the deck.
The BM site has all the older drivers availible. I’m not sure, but I think the 5.5 or 5.6 driver package is what you need for that vintage of software.
joe