vWorkspace 8 error on RDSH

Hello,

After upgrade from v7.6 to v8 of my lab vWorkspace environment I'm having issue on one of my RDSH server. When loging on thru RD session my explorer.exe stops automaticly with the following error

Problem signature:

  Problem Event Name:          BEX64

  Application Name:          Explorer.EXE

  Application Version:          6.1.7601.17567

  Application Timestamp:          4d672ee4

  Fault Module Name:          PNMicSrv.dll_unloaded

  Fault Module Version:          0.0.0.0

  Fault Module Timestamp:          513eb9ab

  Exception Offset:          0000000074614467

  Exception Code:          c0000005

  Exception Data:          0000000000000008

  OS Version:          6.1.7601.2.1.0.18.10

  Locale ID:          1060

  Additional Information 1:          b4ee

  Additional Information 2:          b4ee5de6a2322745523997a782b35692

  Additional Information 3:          7002

  Additional Information 4:          7002734da5f107083f46864a85161336

Published apps are working OK on that server. This RD server is up to date with MS patchs. It is windows server 2008 R2 Ent SP1

vWorkspace is 8.0.0.1189. The error was also on RTM version of vWorkspace.

The ohter server where thing are working OK is also Windows server 2008 R2 Ent SP1, but without any installed update except update KB958488.

Version of explorer.exe on that server is 6.1.7601.17514.

I havent try to remove any updates from server, the last update installed was yesterday before upgrading vWorkspace.

Removing and reinstalling vWorkspace did no help!

Any Idea?