Ashley,
I'm having issues with objects with many point to define his collision boxes.
Some boxes dropped on the mountain will hit the floor and will go through it ignoring the collision box completely on the highlight area.
<img src="https://dl.dropbox.com/u/47035927/temp/collision_issue.png" border="0">https://dl.dropbox.com/u/47035927/temp/collision_issue.png
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Thanks.
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I think I've fixed this for the next build. It seems C2 doesn't like large objects with detailed collision polygons. It might be a good idea to try to stick to smaller physics objects in future.