VSSADMIN continually waiting for response from VSS writers

Hi Everyone,

We have a Corporate Server 2012 Datacenter Hyper-V Host with about 10 VM's which use ARCServe and the Microsoft Hyper-V writer.

We aren't getting backups and when I run a vssadmin list writers I get the "waiting for response"

C:\Windows\system32>vssadmin list writers
vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
(C) Copyright 2001-2012 Microsoft Corp.
Waiting for responses.
These may be delayed if a shadow copy is being prepared.

I've restarted the volume shadow copy and Microsoft Software shadow copy provider services but it still won't list the vss writers.

Looks like a reboot will only resolve the issue. Any suggestions would be appreciated.