Issues with ultimate facebook login via mobile

So I haven’t had any problems until now….running wordpress 3.4.1 and buddypress 1.6.1 and ultimate Facebook…Via a desktop/laptop computer the FB logs in fine however if using my iphone, android phone etc it does not login says “page cannot be found” i see there is a ton of issues arising with this via search on google….can we please get clarification on the issues?