Upon running the included .capx, circles will be created and move towards the square. One of the first circles seems to always ignore collisions in regards to pinning, and often others do as well later.
amirai.net/forums/bugs/collisionbug.capx
Using vista, tested in chrome and IE9.
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Hmm... if you use an 'on collision' event to pin the object instead, it seems to work. So it might be a problem with the 'is overlapping' event... I'll see what I can do.
Ah, found and fixed a bug, thanks.