Ensure the window name is
Garmin Mobile PC
path is H:\GMPC\Que.exe or similar.
Needs to point to Que.exe
The current version of my skin doesnt really do anything special to launch Garmin. Simply the GPS command should do it. It doesnt use an overlay for the GPS screen anymore unless launching the OSK. This was done to lower confusion when trying to get this thing to work also so that I could add additional features to the GPS menu later on.
Try downloading the most recent version of this skin. Do not change the button commands and see if it works. If not it is something with your configuration is incorrect. Make sure the GPS mode you selected is External