When switching audio devices, Firefox 4 beta 12 does not recognize the new device.
i.e. switching from headphones to speakers or even removing headphones and putting them back in. it doesn't seem to recognize that a device has been plugged in, thus no troubleshoot information. this did not happen on 3.6. using win7.
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Did you close and restart Firefox after changing the sound device?
No. That is my point. In Firefox 3.6 I could change devices and there was never a problem. I didn't have to close the browser.