I am the only user of the computer, therefore the administrator. I haven't actually used it previously, but I wanted to sync the contacts I had created on my iPhone back to my computer, which is when I became aware of the issue.
Nope, Address Book app still not working on another account. This is really bizarre.
Yeah, on the leopard DVD, there is a section to install optional applications or something like that. Uploading your address book.app would be amazing if you could- something else at least worth trying! Thanks lots!
Cheers for that, just downloading now. Lets see if it works....
[Edit] It has!! Thanks so much for that allan, it's been driving me mad!