I did a try to install new AMD drivers. The clue is that I am unable to change "GPU workload" setting for one card in a rig. It remains at "Graphics" when I trying change it to "Compute". All other cards (similar ones) switched with no problems.
I had the same problem. Rig of 4 Fury X's with one Pro Duo and the Pro wouldn't switch to compute. I gave up and went back to blockchain drivers. Then I read somewhere someone said they had to restart for it to take effect so I reinstalled the drivers and gave it another shot and it worked. All the Fury x's switch fine with just the driver restart but for whatever reason when I enable it on both of the Pro Duo chips it "appears" like it doesn't work but after a reboot all is well.
I can confirm, at least for my Vega rig, that the new drivers seem more stable than the blockchain drivers. I could never dual mine (eth/dcr) on the blockchain drivers with Vega. I wasted countless hours trying. It's been up on the new drivers for a few days now without a hitch.