To the dozens who keep spamming help for issue with mixed cards. Read the forum... and Claymore's posts
A workaround for rigs with mixed cards (Polaris and old cards): start two miners with "-di" option, one for Polaris cards and second for other cards. Use "-mport 0" option to disable port for remote management and avoid red message in second miner.
I will fix it soon.
It can also happen with Fury and non Fury cards.