Snap applications won't run from KDE Launcher but will from command line

In a console window, run the following:

tail -f ~/.xsession-errors

Attempt to launch your application via Launcher and look for an error involving "is not a snap cgroup". If you see it, then you should attempt the fix that worked for us: 1) Locate the icon in Launcher and right-click it. 2) Click Edit Application and navigate to the Application tab. 3) Add the following to the beginning of the command:

export DBUS_SESSION_BUS_ADDRESS="unix:path=$XDG_RUNTIME_DIR/bus" & 

4) Click OK and attempt to launch your application again.