snapshot using VSS & non-admin user

Hello,

I have the following problem.

Using ABR10 build 12703, I can create a snapshot using VSS even with non-admin credentials (the non-admin user belongs to the "Backup Operators" group).

Using ABR10 build 13762, the snapshot using VSS fails with non-admin credentials. The error is:

***
Log Entry Details
----------------------------------------------------------------------------------------------------------------------------------
Type: Error
Date and time: 02/09/2011 10:53:35
Backup plan: backup_plan_name
Task: Incremental backup
Code: 66.591(0x1041F)
Module: 1
Owner: user@domain
Message:
Cannot access VSS, user is not in the Administrator group. Add user to the Administrators group or disable VSS.
Additional info:
--------------------
Error code: 1055
Module: 1
LineInfo: 5a4b3978f683b842
Fields:
Message: Cannot access VSS, user is not in the Administrator group. Add user to the Administrators group or disable VSS.
--------------------
Acronis Knowledge Base: http://kb.acronis.com/errorcode/

Event code: 0x0001041F
***
If belongs to the local administrators group, everything works fine.

According to Acronis web site, the issue was fixed in build 13545

***
Fixed the issue of a backup failure occurring when using VSS: it can be
performed by local administrator only, a message has been added to an
options page.
***

Any suggestion?

Stefano