Droid won't ring when called?

So my Droid won't ring when it's called. All other sounds are working, including notifications and media, but actual call ringtones won't play at all. Tried turning vibrate on and off, turning phone on and off, made-for-droid ringtones and everything. The only thing I've learned of importance is that I will select a ringtone and then immediately go back into the select ringtone screen and none of them will be selected. Please help!

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