Rclone Manager does not work in Zorin OS 18.1 Core

Sorry if this is the wrong forum for Rclone Manager. I had it installed from Zorin’s app store, the program is able to launch, I can see the icon in the task bar and system tray. The tray icon is responsive, click on it gives “Show App” and “Open File Manager” options, but nothing happen on either option. Hover on the task bar icon show a Rclone Manager mini window, but all black, click on it, nothing happens.

no problem, please post at their forum.