![Citrix XenDesktop 7.x - Black or Blank or Blue Screen when connecting to Published Desktop - blog - Alexander Ollischer | Citrix | Microsoft Citrix XenDesktop 7.x - Black or Blank or Blue Screen when connecting to Published Desktop - blog - Alexander Ollischer | Citrix | Microsoft](https://blog.ollischer.com/wp-content/uploads/2015/09/black_screen_1.jpg)
Citrix XenDesktop 7.x - Black or Blank or Blue Screen when connecting to Published Desktop - blog - Alexander Ollischer | Citrix | Microsoft
![Black screen (black square / black rectangle) when using Controller via Citrix (for example via Cloud) caused by using two displays/monitors with different scalability settings Black screen (black square / black rectangle) when using Controller via Citrix (for example via Cloud) caused by using two displays/monitors with different scalability settings](https://www.ibm.com/support/pages/system/files/inline-images/image-20190717170427-1.png)
Black screen (black square / black rectangle) when using Controller via Citrix (for example via Cloud) caused by using two displays/monitors with different scalability settings
![Grey screen when connecting to Desktop (Workspace 19.12.0.23 (1912) and Catalina 10.15.3 (19D76)) - Receiver for Macintosh - Discussions Grey screen when connecting to Desktop (Workspace 19.12.0.23 (1912) and Catalina 10.15.3 (19D76)) - Receiver for Macintosh - Discussions](https://support.citrix.com/files/public/discussions/monthly_2020_02/281257570_Screenshot2020-02-03at10_39_40.png.67837392a55700ecf4de98a6ff762721.png)