Re: Worldwide routable Garmin maps: URL REMOVED

I have a problem creating a custom set. I first tried the prebuild Netherlands map, wich works perfectly. Then, in view of an upcoming travel I constructed a set of the Netherlands + UK and Ireland with a little bit of Belgium. The result of this construction has white areas in Mapsource, it's like Mapsource sees that I requested them, but they have no content. This includes my hometown area.
Areas I did not request have the generic "no maps" color.
Trying the gmapsupp.img I can see the information missing at my location as well.

Thinking it might be due to user error I repeated the process with a slightly larger area, but the white areas remain.

Maybe this has something to do with parts build on another server not getting assembled correctly into the end-product, or is there some step in the process I missed?