An issue related to the rendering of two islands in osmarender: http://www.openstreetmap.org/?lat=53.799448627453636&lon=-9.64027465922285&zoom=15&layers=0BF Two of the many islands in this area are joined by the tiniest hint of a hairline. This happens to occur just at a tile boundary. The data seems to be in good shape, so I'm thinking renderer bug...