we offer our users the ability to use facebook to sign up on our site and until recently this was working fine.
Since 2 days ago (October 30th) we noticed our registrations using facebook significantly dropped (from around 50-100/day down to 1!) and when taking a look at the process we found that the registration was being cut off and only a small part was showing.
This is how it looks now: https://i.stack.imgur.com/Ilmis.jpg
If I look at the source of the facebook iframe I can see the html tag has overflow set to hidden and if I disable this using Firebug everything looks as it should. But since this is on facebooks end there's nothing I can do about it to prevent it happening to our customers.
Has anyone else run in to this problem and found a solution?
The bug has been reported to facebook here: http://developers.facebook.com/bugs/471852109598483/