Hello mkgmap developers! I experimented a little bit with the AiO Europe Map in Mapsource and the 496 available *.img tiles. ( Source of *.img files: ftp://ftp5.gwdg.de/pub/misc/openstreetmap/download.openstreetmap.de/aio/europa-daily/img/ ) Installing and viewing the AiO map in Mapsource is always fine. The problem is when you "select" the tiles e.g. to upload them to your GPS device. Then Mapsources crashes with an error: Mapsource Error "DSK_PRIVPARTITION.CPP-312-6.16.3.0" . To narrow down the problem I created arbitrary subsets of the available 496 *.img files and installed those into Mapsource. The crash happens always when you try to include more than approx. 290-300 tiles (ca. 2,2-2,3 GB). Same error every time, when you have more than that number of tiles. The problem is also _not_ related to a single tile! I suspect that there is some internal limit, e.g. number of certain elements, an index that exceeds a certain number, ...!? Could it be that the size of the osmmap_mdr.img being >128 MB is a problem? This was some eye-catching coincidence taking into account the Mapsource error DSK_PRIVPARTITION probably having to do with the "file system layout" in the osmmap_mdr.img file ? This problem drives a lot of people crazy since May 2010 ... there are some reports about that on the AiO wiki and AiO forum since then. If I can do any further analysis let me know (i'm not a java guru). Peter