Citrix: XenDesktop, artifacts and display errors

I recently helped building a PoC containing Citrix XenDesktop and XenApp with RES Workspace Manager and Microsoft APP-V, while testing the applications on the different platforms we discovered that a certain application had some strange looking artifacts and display errors when started on XenDesktop. These artifacts didn’t show up when started on XenApp or when using the VMware Console and start this specific application. After some research I found the following posts on the Citrix Forums:

http://forums.citrix.com/message.jspa?messageID=1339409

http://forums.citrix.com/message.jspa?messageID=1527281

So the problem was caused e by the Citrix MMHOOK DLL (Multimonitor support) and there’s  a workaround which is to disable the DLL for the specific program that is not refreshing correctly. As stated in  on of the posts:

Add the executable name to the “Exclude” registry value in the hive: “HKEY_LOCAL_MACHINE\SOFTWARE\Citrix\CtxHook\AppInit_Dlls\Multiple Monitor Hook”

But you should also add the APP-V executables to this list according to the posts on this page. Also keep in mind that sometimes an application will start other executables as well to display information. You can drill down to all of the applications using Process Explorer from SysInternals and with this information you can add all of the executables needed to the Exclude value in the MMOHook registry hive.

 

 

 

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Kees Baggerman

Kees Baggerman is a Staff Solutions Architect for End User Computing at Nutanix. Kees has driven numerous Microsoft and Citrix, and RES infrastructures functional/technical designs, migrations, implementations engagements over the years.

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