[TurboFool]

Well, downgraded to a cooked 3.35 and experienced the problem again within about 15 minutes. Went straight back to 6.1 since there was clearly no benefit to the downgrade. What on earth is the story here? I'd suspect the headset, except there's no logical reason why it would cut off ALL audio to the phone through the handset, as well.

I also noticed today that when it IS working, I get random audio oddities. Sometimes the audio on my phone would play through the headset when not in a call (menu effects, error beeps, etc.), but usually not, and for a while I was hearing a constant flow of silent sound, including random crackles until I soft-reset. Very odd.