Tried to run appimage under Linux Mint 2.3 and the program does not run. System Monitor shows it's there, but no display.
Same here under Linux. Sometimes it gets as far as a window with initial menu, but doesn't progress beyond that.
Don't know if this is helpful, an attempt to run from the command line outputs the following:
~ $ ~/.joplin/Joplin.AppImage
xdg-settings: invalid application name
Try 'xdg-settings --help' for more information.
[54572:0812/210241.307725:ERROR:sandbox_linux.cc(377)] InitializeSandbox() called with multiple threads in process gpu-process.