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Then again, what do I know of these things???
Trust me, whatever you know is oceans more than I do about all of this.
Yesterday I completely restored my iPod, made sure software was up to date via iTunes, and added music back to it. My Mazda recognized the iPod right away (which is a first as over the past year it often refused to recognize the iPod). Music is now shuffling as it should. Hopefully this took care of whatever glitch there was. The dealer said there is an update to the Mazda's bluetooth software and I can "buy" the upgrade if I want. We'll see.