I am using QGIS 2.14.3 Essen.
I wanted to split several polygons with several lines. Both layer are in GK4 coordinate system (used layers generated by: QGIS right-click on layer -> Save as... ) and they optically intersect. But when I use the clipper function to split the polygons by the line layer, I get an empty layer. Why?? Is there any possibility to get log data of the tool? Using the clipper function the other way round, works (getting the lines inside of polygon).
You can download my data here: https://kommsafe.de/#/public/shares-downloads/Ek2uYFrP9Yo9DFiHPPSGi9WFVhbvMj4J