Did some searching and haven't found anything.   Anyone have problems with more than 10 cards using 12.6.   Past 10 it seems to randomly drop a card from hashing and the card that's dropped changes each time the software is restarted.   I've tested this setup with Claymore ETH and Dual and all cards work successfully, but ZEC only allows 10 cards.  Anything past that seems to pull zero hash.  

A little more info.  Win 10 Pro, 11 cards total.  7 Sapphire 580 Pulse, 3 Sapphire 580 Nitro, 1 XFX 580.  All 8GB cards.  All BIOS modded, and OCd as well.  Again no issues when running Claymore ETH and DUAL.

So I tried a few more tests.  I can load 10 cards in ZEC, but the 11th fails each time so I thought maybe I could load 10 in ZEC and 1 using ETH/DUAL.  That also fails.  10 will load but the 11th I get a DAG creation error.  It's almost like there's a limit of 10 set somewhere.   However if I try straight ETH/DUAL mining 11 cards work fine.  

I'm pretty confused

OK figured it out.  I had the VM in Win set to 16GB but apparently that wasn't enough.   Upped it to 20GB, and now all cards load on start.  Hope this helps someone else if they get the same error.