I upgraded yesterday from 6.6.1 to 6.9.2 and the only issues I've found so far is a single Win7 vm that starts and brings up a blue screen in Windows. I'm getting a STOP 0x0000001E aswvmm.sys
When I upgraded to 6.9.2 all went well via the GUI, I then restarted Unraid and had an issue with my flashdrive booting and had to recreate on another flashdrive so I don't know if this is related or just a coincidence but wanted to share. I was able to copy my config folder from a backup to the new flashdrive.
I have another Win7 vm that was the original image that I used to make the vm I'm having issues with now and it still works fine after the upgrade. I don't know if this is upgraded related or not but I'm looking for suggestions to get this vm to successfully boot again.