I've tried City Navigator South America NT 2014.40 map, and it works for me. What I think is there is something not compatible with your devices and Streetpilot. Maybe OS related or hardware.
P.S. I didn't try the DEM img or 3d you use. Maybe try rename/move those and see if that helps.
edit: I can't remember what device you have, but if possible try v2.35 [Only registered and activated users can see links. ] since 800x480 version is highly modified.
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