xfce launchers

[rlharris@oplink.net]

I installed Debian 9 on three or four machines, some are i386 and others 
are amd64.  I installed both Gnome and Xfce desktops on every machine, 
but I am using Xfce on all of the machines.

On at least one machine, some of the Xfce launchers are inoperative, 
including the launcher for Synaptic and the launcher for Midnight 
Commander; however, both of the packages launch properly from the 
command line.

Removing the launcher and configuring another launcher does not cure the 
problem.  Meanwhile, launchers for Synaptic and Midnight Commander 
operate properly on the other machines.