Hi Gerardo Now I tried with 15 pixels snapping threshold on QGIS 1.9-Master. Maybe the problem occures less often, but it still occures... Cheers Stefan -- View this message in context: http://osgeo-org.1560.n6.nabble.com/Polygon-digitalization-tp5040680p5041549.html Sent from the Quantum GIS - User mailing list archive at Nabble.com.