I'm using QGIS 1.8 on Ubuntu 12.04. If I add a polygon layer in SHP format and WGS84 projection and start to zoom in, from a scale of 1:200.000 aprox. polygons on the edges are not drawn anymore and if I zoom in closer than none of the polygons are drawn. The same SHP converted to UTM ED50 zone 30 renders without any problems. The same layer in WGS84 with QGIS 1.8 on Windows 7 renders without any problems. Is there any known bug regarding this issue?