I've just updated to the latest mkgmap from trunk and am now having problems processing tiles that I have previously successfully processed. The error I am receiving is java.lang.IllegalStateException: Polygon offset too large at uk.me.parabola.imgfmt.app.trergn.RGNFile.setPolygonPtr(RGNFile.java:179) at uk.me.parabola.imgfmt.app.trergn.Subdivision.startShapes(Subdivision.java:450) at uk.me.parabola.mkgmap.build.MapBuilder.processShapes(MapBuilder.java:868) at uk.me.parabola.mkgmap.build.MapBuilder.makeSubdivision(MapBuilder.java:633) at uk.me.parabola.mkgmap.build.MapBuilder.makeMapAreas(MapBuilder.java:567) at uk.me.parabola.mkgmap.build.MapBuilder.makeMap(MapBuilder.java:174) at uk.me.parabola.mkgmap.main.MapMaker.makeMap(MapMaker.java:96) at uk.me.parabola.mkgmap.main.MapMaker.makeMap(MapMaker.java:61) at uk.me.parabola.mkgmap.main.Main$1.call(Main.java:169) at uk.me.parabola.mkgmap.main.Main$1.call(Main.java:167) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at java.util.concurrent.FutureTask.run(FutureTask.java:166) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:636) This is when run against a tile containing only contours. If I regenerate the contours using maxnodes=50000 (rather than the default) then mkgmap finishes but I would prefer to keep them larger if possible and this is obviously changed behaviour if I have previously been able to compile against these tiles. I would say this starting happening within the last 10 commits but can't say exactly when Cheers Paul