Problems with Audio Out through USB

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http://forums.androidcentral.com – I had been using the Motorola car dock and the special cable that splits off audio from the usb with a cassette deck adapter to listen to podcasts when I'm driving. The whole thing worked great and paired with smart actions really streamlined getting things up and running. Then a couple months ago, all of the sudden, the audio quit working through the USB. I thought something had happened to my cable, so I got a replacement, but that didn't help. The cassette adapter plays fine when I plug into the head phone jack instead of the usb. Does anyone know why this might have stopped working (HowTos)