crash log: http://pastebin.com/raw/qxUnynnU
steps to reproduce:
place cabinet
put something (like dirt in folder
put folder in cabinet
apply ender upgrade to cabinet
rclick and shift+rclick a few times

cannot reproduce with build.

reasoning:

• the .jar file released elsewhere is older
• the mod version in this repo has not been incremented to tell people it is newer

solution:

• commit a change to increment mod version by 1

could not reproduce with fresh pack and redownload of latest release

aight, let's close it until it comes up again