[mkgmap-dev] Sea (or lakes) issue

Hello, I have a tile out of splitter which covers the area http://www.openstreetmap.org/?minlon=-81.342773&minlat=41.220703&maxlon=-79.... . I did not find yet any option to have the lakes (delimited by natural=coastline) rendered properly. I tried various generate-sea options but did not get the expected result. With no --generate sea I get only parts of Lake Erie and Lake Ontario with water (I guess because there are some water=* polygons in those particular places) With extends-sea-sector, MapSource crashes With multipolygons or no-sea-sectors, both lakes are OK but Ontario is flooded With polygons the whole tile is flooded What options should I use to get it right? Thanks, N.