Just a feedback from my Veeam infra. (veeam 8u2, hyper-v R2 cluster, vss hardware provider equallogic)
Since Microsoft Patch Tuesday May 2015 my backup jobs give snapshot errors for guest system Windows 2003,2008 and warning status for 2008 R2 because hardware vss failed on first try.
I have uninstalled KB3045171 and it's fixed ! Green is back on my reports ^^[UPDATE] Veeam KB article > KB2037