I'm not quite sure what's going on but the results were... Not right. Polygons, curvy shapes, and lines worked right but rectangles went the wrong way. Ovals seem to be fine too.
Demonstration:https://www.dropbox.com/s/in7wnbyt4rfvebk/wut.rli?dl=0
I think I have run into it not long ago. This should fix it.
Find out how Vista icons differ from XP icons.See how RealWorld Icon Editor handles Vista icons.