I want to edit some complex polylines, which I imported from my GPS. These polylines have many vertices and are selfintersecting many times. When I try to split these lines using the 'Split Features'-command the line is split on every selfintersect and not only where I draw the cuting line. What am I doing wrong? Any suggestions? I'm using QGIS 1.8 on Windows8 (64).
This is a know bug: http://hub.qgis.org/issues/4087
Unfortunately, noone came up with a solution yet. For GPS Tracks, you might try to clean and cut them with Qlandkarte GT.