Hi telecastle,
Is this the VM for which you've enabled VM DirectPath I/O? That feature is incompatible with snapshot/suspend/resume of a running VM, since we have no way to capture or restore the state of the passed-through hardware. Allowing the VM to be snapshotted while a device is passed-through would lead to catastrophic failure of the VM (and/or the host) when the device is next used. You should be able to snapshot your Mac OS VM once you remove all the VM DirectPath I/O devices from it.
Cheers,
--
Darius
Message was edited by: dariusd: Clarified that snapshots are OK for a powered-off VM; It's only a "live" VM that won't snapshot with passed-through devices.