I am using QGIS 2.2.0 and want to clip a line layer (roads) so that only those inside a polygon are shown. When I do this using Vector->Geoprocessing Tools->Clip I only get an empty shapefile as an output. I have tried transforming the original road shape file from multipart to singlepart before clipping and still have the same problem.
I've included a screenshot of what I am trying to do.
Does anyone have an idea of what is going wrong or something to do differently?