Since getting my iPhone 4 I am not having any luck playing music via my USB connection to my car stereo. I have a JVC KD-HDR50. I sent JVC an e-mail and they don't know what the issue it. I tried swapping out the USB cables, resetting my phone and no luck. I tried my friends iPhone 4 with the same results. The display says, "reading, reading..." and eventually says cannot play. I'm not sure if this is a compatibility issue with IOS4. Anyone else having similar problems?