Hi, after upgrading to 1.1.3 the SMS ringtones were mute, the normal ringtones no.
i downloaded the ringtones fix but nothing happen.
after sone tries i've the solution:
go to Settings -> General -> Reset -> reset All Settings.
No data or media will be deleted and the ringtones (SMS) will work again!
perhaps it work also for normal ringtones...

P.S. i'm from Italy so sorry for my english!