Running IC2 version 1.64 with Buildcraft 2.2.12 and all required mods (modloader, forge, and modloadermp) on a mac platform (OS X 10.6.8).
My toolbox is working fine, besides crashing the game a la the toolbox crasher bug, but oddly when loaded with tools it's name in my inventory is that of one of the tools inside. The sprite is always correct, and when empty the game calls it a toolbox, but when I load it with, say a batpack, chainsaw, laser, and diamond drill, its name in the inventory is "batpack." I believe that name corresponds to the tool that was leftmost in my hotbar when I loaded the toolbox, but I'm not 100% sure (for example, right now Minecraft's calling it a drill).