If users are experiencing random crashing and or freezing with Citrix hosted applications when using RemoteScan, and have they have version 4.9, 4.10 or 4.11. of Citrix Receiver installed, you may need to disable Hardware Acceleration on the workstation.
This is a known issue with some versions of Citrix Receiver as listed above, however looks to be fixed in version 4.12.
To fix this issue, do one of the following two actions:
1. Disable the Citrix Policy “Hardware Acceleration for Graphics”.
2. Alternatively, edit a registry setting on the workstation called UseD3DHybrid making the value 0 at one of the following locations:
32-bit systems: HKEY_LOCAL_MACHINE\SOFTWARE\Citrix\ICA Client\Engine\Configuration\Advanced\Modules\GfxRender
64-bit systems: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Citrix\ICA Client\Engine\Configuration\Advanced\Modules\ GfxRender
After editing the registry log out of the scanning application and Citrix Receiver completely then log back in.
Here are some links to some Citrix discussions on this issue: