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"CUDA" - SOFTWARE\Wow6432Node\Citrix\CtxHook\AppInit_Dlls\Graphics Helperīasically, these GPOs aided us with VDA 7.15, when upgraded to 1912 these registry settings made all ICA session connections gray. "CUDA" - SOFTWARE\Citrix\CtxHook\AppIni_Dlls\Graphics Helper "Open GL" - SOFTWARE\Wow6432Node\Citrix\CtxHook\AppInit_Dlls\Graphics Helper "Open GL" - SOFTWARE\Citrix\CtxHook\AppIni_Dlls\Graphics Helper "EnableWPFHook" - SOFTWARE\Wow6432Node\Citrix\CtxHook\AppInit_Dlls\Multiple Monitor Hook "EnableWPFHook" - SOFTWARE\Citrix\CtxHook\AppIni_Dlls\Multiple Monitor Hook For me it was registry keys changes under: We had GPOs that applied registry changes related to graphics which caused this. I spent some hours localizing the GPO, unlinked and problem solved. RDP works fine and it is isolated to ICA sessions i assume? Like I said, several customers are affected.ĭoes someone have any ideas how to fix this or tips for further diagnosis? It is, as an example, possible to blindly create a text file on the desktop (with keyboard shortcuts), and the file actually gets created. But it's never the same user who's causing it.Īpart from the grey screen, the session actually works. The CtxUvi crash is always being caused by a user who's logging off, so the issue always occurs either before lunchbreak or in the evening (~5 pm). The issue is occuring about once every week (per Server) but there is no temporal pattern to be found. From now on, all users who freshly log into the desktop just receive a blank grey screen as soon as Citrix Workspace is creating the session window.Īfter a server reboot, everything works normal again.The Citrix Universal DLL Injection Driver has been disabled." Right after that, an error 1003 (also from CtxUvi) is being logged: "The Citrix Universal DLL Injection Driver has detected an integrity error during process creation. In the event log of the Session Host, an CtxUvi error with ID 1005 is being logged: "The Citrix Universal DLL Injection Driver has encountered an unexpected error." Virtual Citrix Session Host (Published Desktop) with fully patched Windows Server 2019 and VDA 7 2012 Over the last few weeks, a weird Citrix issue started to occur on several completely independent Citrix Session Hosts (from different AD domains).