Can't connect and use my iPod to the Xbox 360 using USB, and yes, I have the OMU, both from 2008 and 2011. Yes, I've gone through all your steps that obviously don't work. It's pathetic.
GG, Microsoft. God forbid, I'd want to use a "competitor's" device on a console I paid for.
And don't talk to me about a "Zune"....who the **** uses that?