IE Crash caused by PNMFHook.dll

One of our recently deployed vWorkspace 7.6 customers is having repeated IE crashes on a Windows 2008R2 RDSH server. Looking in the application event log, the offending module is PNFMHook.dll. Example event message is:

Faulting application name: iexplore.exe, version: 9.0.8112.16450, time stamp: 0x503723f6

Faulting module name: PNMFHook.dll, version: 7.6.305.791, time stamp: 0x4fd2e1b1

Exception code: 0xc0000005

Fault offset: 0x0005f331

Faulting process id: 0x8cc

Faulting application start time: 0x01cda80d9d72a419

Faulting application path: C:\Program Files (x86)\Internet Explorer\iexplore.exe

Faulting module path: C:\Windows\system32\PNMFHook.dll

Report Id: dd1c996c-1400-11e2-869a-0050569560ef

Other customers with similar deployments are not having any issues. I am trying to find what is different about this customer environment.

In the meantime, I have removed the DLL from the AppInit_DLLs registry value to stop it loading which seems to have stopped the crashes. However, I would like to know what it does so I know what functionality I have disabled. From the file description (MMR1.2 Hook), I assume it is used for multimedia redirection.

Scott.