My handful of different permutations of the Cresceno G3 have never given me a single problem . . . so . . . .hrrm . . .

Clarification may help, have you differentiated between:

a physical presence conflict at the hardware level . . .

a driver conflict with both cards present using the Extensions Manager . . .

an extensions load order conflict . . .

I'm half asleep . . . so that's all I can think of offhand. :?: