I unplugged my iPod from my computer without ejecting it - had the same issue - speaker only playback.
I plugged it back in..Ejected it correctly (right click eject) from the computer interface and it worked fine......
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When you unplug the iPod I believe it gets set internally set/stuck in speaker only mode
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When you unplug the iPod (without ejecting it correctly with your mouse or drag on a mac)I believe it gets set internally set/stuck in speaker only mode
I unplugged my iPod from my computer without ejecting it - had the same issue - speaker only playback.
I plugged it back in..Ejected it correctly (right click eject) from the computer interface and it worked fine......
When you unplug the iPod I believe it gets set internally