I'm having the same problem but I used gmaptool to combine the maps. I'll try to use mapsource. I'm still studying how it works though. When I import the maps I'm getting an error like the maps are not compatible or they are not mapsource maps. I'm using the latest mapsource software.
follow instructions:remove previous versions,unrar to c:\jklinc\roadguide.ph\
merge reg file w registry
run the registry key, it will be in your Mapsource
dont install in any other way if you want a fully version
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