I don't know. I've reinstalled the mod, but if I edit a sword it gives the runtime crash at loading. I edited the wakazishi as well with same results. I've tried running the game, the editor as Admin, in compatibility mode, etc. I tried running DX7, windowed mode, but if either of those items are edited, it won't work. It's not a big deal, I guess. At this point, it's just the principalities. Anyone else care to try it and see if it happens to them as well?
Windows 7 x64
Phenom II X6 1090T
8GB RAM
Edit: I've also used the item editor on Ranger's Apprentice and Native with no problems.