'Couldn't find the current boot disk in the list of disk' or 'A configuration error exists' App Layering/Unidesk 2.x: Desktop Task Fails

Desktop edit fails with 'Couldn't find the current boot disk in the list of disk' or 'A configuration error exists'. Note, "A configuration error exists" could also apply to an inconsistent snapshot configuration on the VM, so see this KB article as well...