I read on your post to delete the itemdb.xml if you had it. But we don't HAVE to right? I use that for adding npc animations to clothing.
It's only for those too stupid to do anything.
If you understand what you're doing with it, as it would seem you do, you can just extract the new one from the patch, edit it, and data pack it. Mod it however you want, and it's all good.
We tell everyone to delete it because, take a look around, we have about 20,000 people too stupid for daily life. No way in hell they will be able to update and edit an XML.
It's the most updated XML (that I know of), and any edit to it will crash you. So basically, every patch your game would break.