I just stumbled upon what appears to be a bug; I was editing the dimensions of a piece, when I accidentally pressed space. This caused the core to replace the piece I was editing (which may be intentional), and then the editor froze. No buttons could be pushed, but the text in the corner could still be changed.
When I tried to replicate this bug, I found that creating a few shapes branching off from each other and from the core, then pressing space while editing their angle or size for a few of the shapes would freeze the editor.
My best guess is that the editor freezes because the parts are linked in the wrong order or something.
Pressing Space Freezes Editor
Re: Pressing Space Freezes Editor
Ive never stumbled across that bug before.......