MacBook, Aluminum, 13", late 2008
Mac OS X v 10.7.4
2 GHz Intel Core 2 Duo
4 GB 1067 MHz DDR3

I've noticed ever since upgrading to Lion that when I plug in or pull out the headphones while my web browser [Firefox 13.0] is running (maybe when sound is actually playing?) the volume controls lock and I get no sound. I can either restart to get sound again, or sometimes, if I wait about 30 minutes, sound controls unlock and I get sound back.

This is very strange, I know, but I didn't notice the issue until I upgraded to Lion - it's been present through all the patches they've sent out. I haven't been able to isolate a specific behavior or scenario that triggers it, but it definitely has to do with plugging in or removing the headphone from the jack.

Thanks in advance!

sound error headphones greyed grayed out