Update!

I own (7) of the top-end Phoenix cards (dual/PE4) and it turns out that the first two cards that I tested with the new TrashCan didn't work…at which point I gave up and believed there was a problem with the platform or OS drivers…

Upon testing of the remaining cards, I've found that the other five work as expected! I did a ton of swapping cards around and trying to see if the problem followed certain cards or followed cards in PCIe slots. The problem always followed the two cards.

Here's where it gets really interesting. I went back and tested those two suspect cards in an old [silver] Mac Pro and they work fine there. So weird.

I'll contact Active Silicon to see if they know of problems with certain runs/builds/series' of the cards. Maybe they can flash the cards' firmware or something.

Anybody else had this problem?