I recently downloaded QGIS on a Mac OSX 10.7.4 (lion) and purchased a master map shape file, of a particular area.
I am trying to divide it into polygons following features on the master map vector file (.gml 2.shp) and it just won't snap. I have been to snapping and digitising options box, and ticked and changed tolerances far and wide but it just will not snap.
My map layer and topographic options are ticked. I've tried the general options tolerances and still it does not want to snap. I have tried changing vertex to segment and both to no avail, as well as pixels to map.
If I am working at 1:2500 map scale in metres what would a typical tolerance be? (tried 1- 50)
I think there must be a simple solution to enable snapping or have i down loaded file in the wrong format? In MapInfo one had to use keyboard strokes 'S' for snap and 'T' for trace, but this is not mentioned and you can be sure I have tried!