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Application Hangs when Scanning in Citrix XenApp

Another interesting issue today with an application that runs on Citrix XenApp.

Environment
Customer has a Citrix XenApp 5 environment running on Windows Server 2003. Clients are all Windows XP and run the Citrix Online Plugin 12.3 full screen.

RES Workspace Extender is used to integrate locally installed application into the XenApp Session. Users have no access to the local desktop.

Symptoms
This particular application scans invoices using a USB scanner attached to the client and runs them trough a workflow.
Whenever the Start scan button was pressed the application froze.

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