Wont let me log in to Facebook

This app is actually pretty great, but Im giving it one star for one reason: it wont let me log in to my Facebook account. It has before, which is where all my ratings are saved. When I went to post a rating, it wouldnt let me. It says that I need to log out, so I did. And I cant log back in, for a "Log In Failed" keeps appearing. Ive tried deleting the app and re-downloading it, nothing. Restart my phone, nothing. Perhaps giving this a one star will draw attention to this glaring problem and get it fixed.

SamuelHSchabel about Flixster - Showtimes + Tickets, v7.13.4