I have the X930 3.0.0, iPhone 4S 5.0.1, Pandora 3.1.17.

I know there were issues fixed in 3.1.15 (at least according to Pioneer's site)...

but for me, no sound, using the CD-IU50V (I got from Car Toys, so reasonably sure it's genuine). App starts, control, etc seem to work fine, but never any sound.

Any thoughts on what to test?

Should I have the CD-IU51V?

Did you ever get sound before the update?

Do you have sound for the other apps? Do you have sound and video in other apps?