Can't delete a checkpoint in Hyper-V 2012R2

Hello!
Today I tried to delete one of VM's checkpoints in Hyper-V on Windows Server 2012 R2 and got the error "Deleting failed...". I then tried to delete all checkpoints to start a new checkpoint tree but failed again: I was able to delete all checkpoints
except the faulty one:
Why this checkpoint can not be deleted? In this situation no subsequent checkpoints can be regarded as fully functional because all of them will be "under" the faulty one.
I never had this problem in Windows Server 2012 (not R2).
By the way, what's the purpose of renaming snapshots to checkpoints
in R2?
Thank you in advance,
Michael

Hi,
I can’t find out the similar issue. Please try to disable the AV soft, if you are using the WSS backup please after the WSS finish then delete again.
More information:
Removing Old Snapshots from Hyper-V
http://social.technet.microsoft.com/Forums/en-US/5cd875f7-bf12-419b-a345-08725249b337/cant-delete-a-checkpoint-in-hyperv-2012r2?forum=winserver8gen
Hope this helps
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