Collision polygon editor doesn't save (OS X)

I can edit/create collision polygons, but they don't seem to be remembered by the editor. If I return to the scene editor, then go back to editing a freshly edited polygon, the poly is gone (poly gone!). Saving the level or the object itself also doesn't save the collision polygon.

I tried it under Windows and it works fine.

(love T2D btw, wish I had bought it a long time ago!)