causes and things to try to fix it:
--Somtimes can be sorted by an SD card format and a card restore from PC
--is the the TomTom Navigator.EXE within the TomTom folder on your SD card -
[delete the .exe from "my device"]
-- The Map is not compatible with the TomTom version being used
-- The Map is not in the correct folder, normally the My Documents folder
-- The map has not been unlocked correctly
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