How can I reactivate the fn + arrow buttons that changed in Safari 5.1?

I've noticed that home/end/pgup/pgdown aren't working on my main user account but if I create a new user and log in as them, they all work as expected. So I figure it's a snipe hunt for some preference/library/plugin manager that is doing horrible things to Safari. I already purged SIMBL but it doesn't look like it helped.

(edited to add) I poked around some more and I guess I made some changes to my default key bindings at some point - I removed ~/Library/KeyBindings/DefaultKeyBinding.dict and now PgUp/PgDown/Home/End all work as I expect in a browser, although now I'm stuck with emacs navigation inside of editboxes. I can manage.