Newbie with questions

[Seldom]

Sorry to ask a dumb question, but to to be clear... does your map have a proper background polygon? If not, that could cause the problem you describe.

Definitely has background polygons, in some cases I've had more than one , but that's really ugly in BaseCamp/MapSource.  if that happens all you can see is the preview polygon (very jaggy)  with none of the detail.

[Seldom]

Sorry for getting so far off-topic there.

Perhaps, if we ask nicely, we could get Indrid to move the DEM discussion to http://forums.gpsfiledepot.com/index.php/topic,2856.0.html

[Seldom]

Personally I think this needs further investigation - we have discussed this on another site as you know .

I gave it some further investigation.  I deleted DrawPriority settings from my local tile, sent it to the nuvi, and, much to my dismay , the tile overlaid the DEM basemap, just fine.  Of course, in the meantime, I rebuilt the whole set to DrawPriority 31, and in so doing found a number of multiple dictionaries.  Maybe those were causing the problem.