Check your IMG-file with [Only registered and activated users can see links. ]. You might have a IMG-file with MS flag = 1 and it must be set to 0 for usage with BaseCamp.
MapSource sets the MS flag to 1 if you create a gmapsupp.img with MapSource or MapInstall.
Info from old GMapTool thread - [Only registered and activated users can see links. ]
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