Hi Thorsten,
Maybe you should not use resolution 10. As mkgmap adds an empty level with res 9, this might simply be
unknwon to MapSource. GPSMapEdit shows "GPS zoom" unknown for resolution 9:

besides that I did not find any clear hint that explains this problem, but I fixed a few errors.
Please try again with r2627.
If that doesn't help, please keep the ovm_*.img files and post a link to them.
Gerd
> Date: Tue, 28 May 2013 16:01:47 +0200
> From: kukuk@suse.de
> To: mkgmap-dev@lists.mkgmap.org.uk
> Subject: Re: [mkgmap-dev] overview-branch: missing tiles in mapsource
>
> On Tue, May 28, GerdP wrote:
>
> > Hi Thorsten,
> >
> > maybe an empty level. I think the normal img files should be identical to
> > those created with the
> > trunk version.
> > Are the maps available on http://osm.thkukuk.de/ ?
>
> Yes, it's TK-DACH-Basemap.7z
> Fuerth (left from Nuernberg) is missing.
>
> Thorsten
>
> > Gerd
> >
> >
> > Thorsten Kukuk wrote
> > > Hi Gerd,
> > >
> > > On Tue, May 28, GerdP wrote:
> > >
> > >> Hi Thorsten,
> > >>
> > >> does that mean that the overview map is ok but the gmapsupp is not?
> > >> Or is the generated *.nsi incomplete?
> > >
> > > The overview map is Ok, the gmapsupp.img generated by mkgmap is Ok,
> > > too, at least if you copy it directly to the GPS and don't install
> > > it with mapsource.
> > > The tiles are all there in the mapsource directory.
> > > If I look with an hex editor in the *.tdb file, the tiles are
> > > listed there, too.
> > > Qlandkartegt has no problems to display all tiles, too.
> > > So for whatever reason, MapSource ignores some tiles
> > > and does not show them.
> > >
> > > Thorsten
> > >
> > >> Gerd
> > >>
> > >>
> > >>
> > >> Thorsten Kukuk wrote
> > >> > Hi,
> > >> >
> > >> > I found a problem with the overview2 branch from last week.
> > >> > I haven't tested it yet with the current version.
> > >> >
> > >> > Sometimes single tiles are missing in Mapsource. They are available
> > >> > and working in the gmapsupp.img generated by mkgmap, and the tiles
> > >> > are available in the install directory of MapSource. But MapSource
> > >> > does not display it, only the overview-map.
> > >> >
> > >> > It does work if I remove all ovm_* files before running mkgmap with
> > >> > --tdbfile.
> > >> > So something like:
> > >> > mkgmap --gmapsupp ...
> > >> >
> > >> > mkgmap --tdbfile 7*.img
> > >> > => single tiles are missing
> > >> >
> > >> > rm ovm_*.img
> > >> > mkgmap --tdbfile 7*.img
> > >> > => works, but of course no overview map available.
> > >> >
> > >> > What would you else need?
> > >> >
> > >> > Thorsten
> > >> >
> > >> > --
> > >> > Thorsten Kukuk, Project Manager/Release Manager SLES
> > >> > SUSE LINUX Products GmbH, Maxfeldstr. 5, D-90409 Nuernberg
> > >> > GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 16746 (AG
> > >> Nürnberg)
> > >> > _______________________________________________
> > >> > mkgmap-dev mailing list
> > >>
> > >> > mkgmap-dev@.org
> > >>
> > >> > http://lists.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
> > >>
> > >>
> > >>
> > >>
> > >>
> > >> --
> > >> View this message in context:
> > >> http://gis.19327.n5.nabble.com/overview-branch-missing-tiles-in-mapsource-tp5762976p5762978.html
> > >> Sent from the Mkgmap Development mailing list archive at Nabble.com.
> > >> _______________________________________________
> > >> mkgmap-dev mailing list
> > >>
> >
> > > mkgmap-dev@.org
> >
> > >> http://lists.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
> > > --
> > > Thorsten Kukuk, Project Manager/Release Manager SLES
> > > SUSE LINUX Products GmbH, Maxfeldstr. 5, D-90409 Nuernberg
> > > GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 16746 (AG Nürnberg)
> > > _______________________________________________
> > > mkgmap-dev mailing list
> >
> > > mkgmap-dev@.org
> >
> > > http://lists.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
> >
> >
> >
> >
> >
> > --
> > View this message in context: http://gis.19327.n5.nabble.com/overview-branch-missing-tiles-in-mapsource-tp5762976p5763007.html
> > Sent from the Mkgmap Development mailing list archive at Nabble.com.
> > _______________________________________________
> > mkgmap-dev mailing list
> > mkgmap-dev@lists.mkgmap.org.uk
> > http://lists.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
> --
> Thorsten Kukuk, Project Manager/Release Manager SLES
> SUSE LINUX Products GmbH, Maxfeldstr. 5, D-90409 Nuernberg
> GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 16746 (AG Nürnberg)
> _______________________________________________
> mkgmap-dev mailing list
> mkgmap-dev@lists.mkgmap.org.uk
> http://lists.mkgmap.org.uk/mailman/listinfo/mkgmap-dev