I am currently developing a Visio 2010 shape which has multiple geometry sections in it, and thought I should check it in Visio 2013. To my surprise, I found a difference in the rendering of the shape’s line caps, and I thought that I had found a bug in Visio 2013, but further investigation revealed that Visio 2013 has fixed a bug in Visio 2010 (and earlier)…
I create a square shape with an inscribed triangle and changed it’s weight to 6 pt in order to exaggerate the effects of different Line Caps in my test shape. Notice that the Line Cap can be one of three values : Round, Square or Extended, which is equivalent to 0,1 or 2 in the LineCap cell in the ShapeSheet.