I just upgraded my IPhone 3s to the new iPhone 4s. I love to play my music in my Yamaha home theater through a Yamaha dock. It worked seamlessly event through the remote.
Now it happens that the new IPhone won't play any music through the system speakers. It charges alright but when I hit play the only speaker that works is the one from the phone. Is it a hardware issue??? I'm really frustrated as it seems that all my prior investments are rubbish because of Apple.
just solved it! Aparently there is an issue with my Logitech dock that makes iOS 5 do really strange things. It can start playing music without my command for example. Or sometimes the speaker/volume icon on the screen won't disappear after I remove it from my dock.
My solution: restart the iPhone. Everything back to normal. iPhone 4s finally playing all my music as it was intended to do. Really thought this was a new issue.