Client get's a internal server error when breaking Player Interface.

Block breaks but does not drop the Player Interface item.

A previous issue where breaking a TE machine caused a crash and they fixed it with removing the cofh folder. (tried this, no change)

client does not print any errors while on a server
Client does crash in single player:
here is the crash log for that.
http://pastebin.com/Sc9EGmY8

Here is the error from the server's terminal. (no crash log)

thanks! :D !