I tried to 'delete all' snapshots and I instantly got an error:
The attempted operation cannot be performed in the current state (Powered off).
Which makes no sense, but whatever. Seeing as it didn't take the usual 60+ seconds needed for a snapshot of the size, I assumed the snap was actually still there and in use. I browsed the datastore to confirm that the snap VMDK's are indeed still present. I also see the .vmsd file appears to point to the latest snap vmdk.
Odd thing is that snapshot manager no longer shows any snaps, so I can no longer delete them via the GUI.
Any advice on how to clean up this up?