We had the same problem after upgrading from esxi 5.5 u2 to esxi 5.5 u3. Our VM's (MS Server 2008 and MS Server 2012 R2) crashed after deleting snapshots and Acronis couldn't backup the VM's. After installing older vmtools the VM's crashed not so often. Now we rolled back to esxi5.5 u2 and we have no snapshot problems yet.
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