Hi Andrzej, thanks, I was able to reproduce the 0x4a problem now and - as assumed - the problem seems to be caused by a size filter. The attached patch changes the filter so that it is skipped . Please check if this fixes your problems. I'll nowcheck the 2nd problem regarding "overview-levels seems to be ignored for mp format." Gerd ________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Andrzej Popowski <popej@poczta.onet.pl> Gesendet: Dienstag, 5. Juli 2016 16:05:07 An: mkgmap-dev@lists.mkgmap.org.uk Betreff: Re: [mkgmap-dev] Error in mkgmap r-3676, wrong preview generation Hi Gerd, see attached example. I have used mp format because I couldn't invent equivalent example with osm data. See that both background 4B in level 1 of detailed img and map area 4A in overview consist of 2 parts. Mapsource and Mapinstall use only one part of object 4A. Other note: parameter overview-levels seems to be ignored for mp format. -- Best regards, Andrzej