often a red "X" appears in the RDP opening.
Attached is the screeshot.
Would you first be able to send us your last 2 .lyt files from %localappdata% -> Devolutions -> RemoteDesktopManager using the link I will send you via Private message?
With that said, there are a few things you can try to get rid of the red X.
First, try going to the Window tab and click Reset Layout
Sometimes, that can fix some Red X issues.
If that doesn’t work, you can try to close RDM, then navigate to %localappdata% -> Devolutions -> RemoteDesktopManager and delete every file with the .lyt extension.
If neither of those methods does the trick, you will have to move the RemoteDesktopManager folder from localappdata to your desktop, then uninstall RDM, reboot your computer, reinstall RDM and move the RemoteDesktopManager folder back in its original place. Once you reopen RDM, the red X should be gone.