[3.0.3] Input inventory crash

[Paril]

Launcher/pack Version: Latest development (3.0.3)

Operating System: Windows 7 x64

Version of Java: 1.7.0_04-b20 (x64, of course)

Description of Problem: A very strange bug, related to input. Pressing any button on my mouse causes a crash when the inventory is open. It only happened after changing my controls - game works fine beforehand. I use an odd layout for my controls (mouse1 is attack, mouse2 is jump, mouse3 is Drop; I have comma and period bound to my mouse4 and mouse5 buttons, and they are Inventory and Use Item, respectively). Using this layout causes Tekkit to crash every time I click or press Inventory when any inventory is open.

Error Messages: White screen, error in log.

Link to pastebin of log: http://pastebin.com/mKwU7RkY

Any input (pun not intended) would be appreciated.

EDIT: I've isolated the problem to be the "Drop" key. It crashes when it is bound to MOUSE3. I can temporarily work around it by binding my MOUSE3 to another key, but it'd be nice to have the ability to use it outside of MC as well

-P