Anyone had trouble with the AMD Wattman compute workloads switch using 17.12.2 minimal setup drivers?

I just added two Rx570s to three Rx580s already running in a rig.
Now one of the RX580s won't switch from graphics to compute workload - it appears to work but when Wattman restarts it still shows graphics and this card is slow in Claymore Dual Miner 10.2.
All the other cards are fine and this card switched properly to compute before adding the extra two cards.

Any ideas? This is a strange one.

I was looking to upgrade my other rigs from the Blockchain beta drivers but now I'm not sure I should.