Ticket #910 (closed bug: fixed)
Rubber band canvas artifacts when editing vector layer that is not in edit mode
In 0.9.1 release, if you try to edit a polygon when editing is not enabled, you get artifacts on the canvas from the rubberband where your polygon border would have gone had the polygon been editable. In my case, little red lines from one vertex to the attempted new or moved vertex. These artifacts remain on the canvas if you start a new project.