Using RDM I've noticed that when moving window tabs to another monitor or separate them from the main RDM interface, there are graphical anomalies that only go away when you completely close the application. I've been unable to search and find something related to this other than adjusting smart sizing, but I am unable to find a setting that will cause the issue to go away. Attached screen shots of the visual affect. The graphical artifact is not intractable, but it is persistent across any open application.
Screen Shot 2018-02-16 at 9.12.44 AM.png
Screen Shot 2018-02-16 at 9.12.34 AM.png
This is a known issue that has been fixed internally. Could you try this version and tell me if this fixes the issue: https://www.dropbox.com/s/j50kola6ul8uuww/Devolutions.RemoteDesktopManager.Mac.188.8.131.528793109.dmg?dl=0