Take a look at the Menu.skin or any skin that has the GPS button, and check to see what code the that button execute. Some skinner just put the command as "GPS" which default execute whatever your gps option in RR.ini. Other skinner choose to execute the GPS button with a RUN/LOAD command and that is different from one another.
If it run with the default BMV2 skin, it runs as it shoud be. You can try the skin I modified called "CFX Re-work". It was created to work with iGuidance well.