www.algodoo.com

Make a chain > right click > Selection > Ungroup > right click on any part > mouse-over 'Chains' > Crash.

I imagine the Chains menu isn't supposed to be there after un-grouping the parts. Should be an easy fix though, yeah? ^^

Seems like you're not the only one who faced this problem. My Algodoo also crashes when I do the same thing!