You mean even your print doesn't work? Always try to add @Override over overriden methods. Show your WildCraftItem class as well.
Also I'm not quite sure if you set up your capability correctly, because I haven't dealt with item capabilities yet, but the forge documentation does say to use @CapabilityInject on your capability field. Not sure if you should be implementing ICapabilityProvider in your item class, but as I said I haven't dealt with item capabilities so I not quite sure.
Well I figured one thing out, I was just really blind and registered the darn thing to the wrong class, oops XD Now it's at least printing-- but right clicking consumes the item and still doesn't open the GUI o.o
Oh shoot! That would definitely do it! O.o Dang, those stupid little brackets can be such a pain XD
Ahhh, now it straight up crashes XD It is actually throwing an error though, so I'll see what I can do about that on my own first and come back if I can't figure it out. Thanks for helping me figure things out!