I again started getting this problem today, cost me my Cup final too actually. I had this problem from October last year and it was finally resolved in April of this year. Numerous complaints and queries were sent to Nordeus tech support but they insisted it was Facebook's issue. I updated my Facebook app (iOS 7) today but still won't login. I never understood the problem as I could login to my friends Top Eleven but not mine. Tried updating game, Facebook, logging in and out, deleting both apps and re-installing, deleting caches etc. etc. as Nordeus suggested but it never worked. Then one random day in April it just started working again. I really hope this issue doesn't affect anyone else for as long this time. Maybe someone will find a solution.