Well, since no one seemed to be interested in updating ItemRackFu, I did it myself - or at least tried to.
My lua-scripting knowledge is near zero but I managed to rewrite the essential parts of ItemRackFu to make it work with Itemrack 2.x+
Tested only on Itemrack 2.1 and incompatible with any pre-2.0versions. Hope this helps.
Is there any chance to add the options to show/hide your helm and cloak, like the old ItemRackFu? Or does it have to be an option within the ItemRack client first? (The options are also absent from ItemRack 2.x)
I have ItemRack 2.1 and the latest revision of ItemRackFu but I get the same error the OP described; VolumeFu and LocationFu, among others, do not appear on my FuBar. Additionally, I get the following error on login to game - any suggestions as to what might be the problem? Thanks in advance
EDIT: Nevermind, I did not realize there were links to the updated ItemRackFu embedded in the posts above - downloaded the one from Imaran and it works great. Is there a reason why this is not included on files.wowace.com?