Steps to reproduce:
Im currently using the mac version with this info:
Version 1.2.77 (86c9c6e78e532440b82c8400f328730b0d72448e) Java 1.8.0_05
Wow, nice find!
One very nasty crash, I have added an issue for this: DEF-1706 Thanks for reporting!
This issue is not only for box but also for other shapes
Thank you for reporting additional information for this issue. I am however fairly certain that we will not fix this issue in the current editor. The new editor is getting very close to release and the same issue doesn’t happen in the new editor.