Do you have SnapShots?
If you have it you have to do the "Commit", because they take up a lot of space.
The user created a snapshot, but I deleted them (to consolidate down to one disk) before trying to inflate it.
Does something still need to be done because of this?
Can you attach screenshots of the disk space available on the datastore, the VM directory, VM settings showing vmdk properties? This can give us a clear picture of what is going on.