Symantec has released Service Pack 1 for Backup Exec 2010 R2.
Information and download links:
Backup Exec 2010 R2 revision 4164 Service Pack 1
Release notes for what has been fixed:
http://www.symantec.com/business/support/index?page=content&id=TECH147433
There are several fixes related to the Deduplication option and the Virtual Agent (AVVI, VMware) so I'd recommend customers updating asap.