Still happening from time to time for me as well.
This is the cure - http://superuser.com/questions/460075/why-does-
xscreensaver-not-allow-me-to-enter-my-password
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*** This bug is a duplicate of bug 1219407 ***
https://bugs.launchpad.net/bugs/1219407
Running Ubuntu Studio 14.04 - Trusty with Skype Version 4.2.0.13 and still
experience the hellish buzz when skype plays notification sounds. Hoping for a
permanent fix.
(Thanks for the script Reuben T. - y