Every now and then, say 10% of the time, I create a sketch of some closed shape such as a rectangle, and I get these tiny, little vestage sketch lines propagating out from one of the corner intersections. They are only visible if I zoom way, way in. I don't realize they are there until I try to extrude, sweep, cut, etc., and of course the feature fails, or it tries to extrude-thin or some crap like that. I would be the first to admit that I may be doing something bone-headed here, although it is nothing obvious to my observation, but is anyone else here having this occur? Just another thing in the list of minor annoyances. See attached.