Wiki Plugin Users Cannot Link to Other Pages Only Admin

I'm having trouble getting the wiki plugin to work. I created the starting wiki page and gave access to anyone to edit. From there, any new user can in fact edit the page. However, they cannot create links to existing wiki pages. As admin, when I click the link icon in the toolbar, it shows me a list of existing pages to link to. All other users don't have that view when they highlight a word and click the link button. Is this a bug? I've played around with permissions, making another user account full WP admin and it still won't show that list of pages.