Unable to hear sound via usb headsets after 10.10.2 update. Any advice? Thanks!

We just updated our school iMac lab to 10.10.2 and now several machines will not play the volume through headsets while on System Preferences. We have plugged/unplugged and made sure that usb is selected within system preferences. Sometimes, when we go into an app or website that USES sound, it will then work! Unfortunately we have high-stakes testing happening over the next couple of weeks and we need to be able to test the sound prior to taking the test.
Any ideas? Any help would be greatly appreciated! Thanks!
Sharon

sorry, lost track of this thread for a bit.
you need to figure out which preference files in the main account are causing the problem. the one that i suspected is not it. I don't know which one it is, sorry.
maybe somebody else does.
one thing you can always try is the nuclear approach. move the whole folder /users/username/library/preferences to the desktop and log out/in. that folder will be recreated and all the files inside will be recreated with default values when system needs them. see if that fixes the issue. if it does you can start moving the files you need from the preferences folder on the desktop back to the one in the library. you'd need to log out/in for some of them. this is pretty time consuming so I would first see if someone else has another idea.
in the worst case scenario you can always migrate to a new user account.

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