AMD don't support theirs GPU on Mac as Apple is writing their own drivers.
Yes, I know that, nou, and thanks! (Your posts have been helpful to me in the past.)
I usually include a disclaimer when I post here, but forgot this time:
"I know AMD don't provide support on the Mac, but others users of this forum may have run across this problem, so I'm asking the community anyway to see if I get lucky."
If I don't find an answer here, and can't wiggle it out on my own, then I'll just get an nV 570....