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Apps launch but aren't visible to users


XA 7.15 LTSR CU2



We had one server yesterday where apps would launch from StoreFront but not be visible to the user. 

  • The apps appeared in Citrix Studio as though everything was normal but they didn't seem to "attach" to the user's Receiver
  • It happened with all apps on the server (including notepad.exe)
  • We tried a variety of Receivers
  • Other server were working fine (it was just one machine out of a few hundred)
  • Rebooting resolved it
  • I should have tried Shadowing the session to see if it was, in fact, starting normally but didn't think about it until it was too late

I don't have anything to troubleshoot on now because the reboot fixed it.


Most of our servers are CU3 or CU4 so I'll updated this machine.


I was just wondering if anyone else has seen this or has any troubleshooting suggestions if it occurs again?


Thanks,  Jeff

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I'm experiencing this issue as well.


Rebooting doesn't always fix it.  I have physical servers running Windows Server 2016 with Quadro P4000 cards publishing Seamless Applications with CVAD1906.  I just updated video drivers on a few servers to see if it makes a difference.


I  have seen this in the past when:

* Dedicated GPU is in use, and the onboard GPU is not disabled

* As of 1903, when using the enableWPFHOOK registry key to enable WPF Acceleration with the GPU



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