I asked this elsewhere, but I think it got lost so here goes again:

I got my pictures loaded, but the wall paper ONLY comes on when I start the car, let the map stay on there for a few minutes and don't touch any buttons. If I do ANYTHING during a trip (use the map, make a call, use the radio) then the wall paper won't come up al all...am I doing something wrong? Can I change the default to be the wallpaper rather than the map?