I upgraded from Unraid 6.9.2 to 6.10.0-rc2 and had a problem where my VM's "Graphics ROM BIOS" path was missing / blank.
The upgrade went fine but after a 2nd reboot the VM wouldn't start. I then found that I could no longer choose my vBios because the path was blank. I tried manually entering the path but this didn't fix the issue starting the VM. I've since downgraded, so I can't share the exact screen capture 😧. The one attached is just showing the location. The actual drop down was