No sound through the USB headphones

When I plug in my USB headphones, I get no sound until I go to the Sound panel in System Preferences, go to Output, highlight the headphones, and then turn "mute" off and on at the bottom of the preference box. After that the sound works fine, until I either unplug the headphones or put the computer either off or to sleep.
I am using Logitech headphones (350) but I'm not sure if the headphones are the problem.
I really can't tell if this is a hardware or software problem.
Thanks,
Reed

Hi Templeton,
But the problem is not merely a switch to the default setting:
a) even when the computer goes to sleep and wakes up and the headphones remained plugged in, the sound disappears and I have to click and unclick the mute button to make it work. The settings have all remained the same.
b) the same thing happens with another pair of headphones
c) it didn't used to do this, the problem started a few weeks ago. (I can't pin it down to any particular upgrade or installation.)
rr

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