Hi guys,
update on my side. I contacted the producer Nine Dots Studio and they pointed out to me, that either the graphics driver or Citrix might cause the issue. Since updating the driver didn't fix it (Geforce GTX 1080), I checked on my installed Citrix Workspace.
As chance wants it, Citrix offered me an update. After the successful update (for which I had to manually terminate Citrix Workspace after the update download finished, but before installing) now the game runs fine without the workaround.
So you might try updating or closing your Citrix.
My current Citrix version is: 19.9.0.21 (1909)
Post edited October 28, 2019 by Maggnet