Signed Books are appearing empty. I'm presuming this is because you are simply using the item id to generate a new item. Is there a way of actually cloning the data as well?

Someone reported this in IRC... I haven't had time to look into it yet. The code does allow for saving of NBT data, but I may be missing something in there.

Also, this functionality was only added in 1.7.2, so 1.6.4 and earlier versions don't support item NBT data.

Thanks for looking into it. I'm running 1.7.10