This is right, Boyd - multiple maps of the same drawpriority is the issue. Though after much experimentation, and reading about the TYP format, I've come to the conclusion that the draworders are not 'grouped' into drawpriorities, and it would probably just be bad practice to use the same drawpriorities across multiple IMG's. I'm just going to use unique drawpriorities per map to make sure it's reliable.
In regards to the basemap thing, it's only on basecamp, and nothing seems off on the etrex at all. Would it be possible to ask you (or anyone really) to generate a map, with a single polygon anywhere in the world and a custom TYP for that poly, and upload so that I can test it on my basecamp? This would help me figure out if it's something I'm doing wrong...
In regards to the basemap thing, it's only on basecamp, and nothing seems off on the etrex at all. Would it be possible to ask you (or anyone really) to generate a map, with a single polygon anywhere in the world and a custom TYP for that poly, and upload so that I can test it on my basecamp? This would help me figure out if it's something I'm doing wrong...