http://pastebin.com/MZAt4n62
I have a slight feeling this might have something to do with mods being removed while items were in the drawers.

Nope, that's not it.

Most frustrating, it looks like the physical state of the world is changing in the middle of executing one pass of the renderer. E.g. I ask the world what block exists at the spot and it says "it's a drawer". Then a bit further down I ask it again and it says "nope changed my mind it's air".

I'll see what I can do.

Try this one: https://github.com/jaquadro/StorageDrawers/releases/tag/sd-3.2.1

I'm not 100% sure how it's getting triggered. So I can't really test it in SSP and the crash is happening while on a server with 30+ people on per day... I could be just flying by someone's house then crash and be fine for hours.

I think it was a rare race triggered by someone breaking a drawer, or maybe related to a chunk loading or reloading. By most unfortunate luck, the drawer was there when it started to render the items, and then it wasn't.

Makes sense. Thanks for the quick reply and possible fix! Sorry I can't really test it. I will make sure to update you on it when possible.

Going to assume this is fixed.