I had this recently and I concluded it was stuck either creating or thinking it was creating a snapshot. Try a:
service mgmt-vmware restart
on the host that the vm is running on and if it is connected to a VirtualCenter / vCenter also try a
service vmware-vpxa restart
if the first one on its own doesn't fix it.
Also confirm in the VM's folder that there are no snapshots already there, if there are you may need to create and delete all snapshots after the serives are restarted as above.