I am having an increasingly infuriating problem with my iphone 3g. I have an ipod touch, and ipod video 5.5g and a iPhone 3G all syncing with the same itunes library. All used to work fine in my car stereo but now my iphone won't work. It tells me there is "no music data" (when I know there is, all other devices see it just fine). Ipod touch and Video work but my iphone balks at it every time and displays that message. My question is what could cause this? I had my iphone replaced due to this and my new one does it as well so its got to be some setting or something that isn't working right. My gf's iphone 3g works no problem which makes this even more confusing. Any help would be appreciated. The cd receiver is a Kenwood MP438U. I've tried them and they said its a bluetooth issue when I don't even use bluetooth to connect it. then they told me I can't have it on shuffle when I plug it in (which I know is bogus as I used to all the time and still do with my other iPods).