Thank you for your message.
I have just tried connecting from a Viewer on Linux Mint 19 Cinnamon to a remote Host, but couldn't reproduce the issue as the Host screen is displayed as normal.
Could you please clarify the following:
1. Do you have a Monitor driver
installed on a remote Host machine? If it is installed, we recommend that you uninstall it as the Monitor driver as it is only used for the blank remote screen feature. You can check if it's installed in your Windows device list and in the Host's settings as well. In order to uninstall the driver, open the Settings for Host window and navigate to the Driver
tab and click Uninstall
2. If there is no monitor driver installed on the Host machine, please try enabling the Use legacy capture mode
feature. You can enable it in Settings for Host -> Other
3. In addition, please double-check if you have the Blank the Host's screen
checkbox selected in Connection properties
-> Additional Properties
on the Viewer's side.
Please let me know if the issue persists.