Red "X" in the navigation pane or credential list

There is a red "X" in the navigation pane or in the credential list.

Solution

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.

If that does not work, try closing Remote Desktop Manager, then navigate to %localappdata%\Devolutions\RemoteDesktopManager and delete every file with the .lyt extension.

If neither of those methods does the trick, move the RemoteDesktopManager folder from localappdata to your desktop, then uninstall Remote Desktop Manager, reboot your computer and reinstall Remote Desktop Manager. Once you reopen Remote Desktop Manager, the red X should be gone.