I don't notice the problem with Garmin's City Navigator products, but the level of detail on those is much lower than a comparable area with topo. My mkgmap compiled maps are non-transparent and routable with a full range of data types. I don't have that problem with maps I compile with cgpsmapper, but those are usually semi-transparent and non-routable, usually just topo, hydrography and woods. The second will bring back a cleaned up image. The first Control-G may blank the screen. Control-G hit twice will flush the cache and clean up the image with newer versions. I think it has to do with the way the newer versions of MapSource cache imagery. Some images and a discussion thread posted below. These have all been from maps I've made myself, so I may be missing some command line switches that would clear them up. I've noticed it since MapSource 6.14.xx, 6.13.7 was the last version that didn't have the problem for me.
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