I seem to be unable to edit/create non-globally shared lookups. I can call/link the editor view in other apps but i cannot edit or create lookups that are app specific using http://apps.splunk.com/app/1724/ (Lookup File Editor).
it happend to me, that I had to set the owner of a lookup file to nobody/no owner to be able to modify it using the editor.
View solution in original post
Have you checked the permissions for those lookup files and those Apps? You may have only read access to them.