ABR 11 Adv WS: Error "Failed to create the volume snapshot"

I have ABR 11 Advanced Workstation installed on a Windows 7 64-bit system.  I am backing up my C: system partition to a D: partition (same physical hard drive). I have been getting the errors shown below.

I found the posting http://forum.acronis.com/forum/24553 but the error codes are different so I thought I would ask. The very last post by Alexander Brajkin says:

This is a known issue and errors won't appear in future product updates in such situations. Meanwhile these messages can be safely ignored - backups are created and can be restored just fine.

Is this true in my situation?

TIA...

Error code: 50247

Module: 16
LineInfo: 14181c22ef45b06d
Fields:  $module : C:\Program Files (x86)\Acronis\BackupAndRecovery\DiskBundle.dll
Message: Failed to create the volume snapshot.
--------------------
Error code: 65520
Module: 0
LineInfo: bd28fdbd64edb8bc
Fields:  code : 2147942450
Message: The request is not supported
--------------------
6   Information   1/23/2012 4:47:21 PM   Locking partition C:...
7   Information   1/23/2012 4:47:21 PM   Failed to get VSS metadata for backup.
Additional info:
--------------------
Error code: 704
Module: 64
LineInfo: 26556611c50a732a
Fields:  $module : C:\Program Files (x86)\Acronis\BackupAndRecovery\DiskBundle.dll
Message: Failed to get VSS metadata for backup.
--------------------
Error code: 65520
Module: 0
LineInfo: bd28fdbd64edb8bc
Fields:  code : 2147942450
Message: The request is not supported