My macbook was having trouble choosing audio output when I changed headsets. It kept defaulting to Procaster Audio Redirector instead of the internal speakers or the new headphones.
Turns out LiveStream Procaster was responsible for this (fiends!*). To uninstall, do not drag the app to the trash. Instead, go to: Your hard drive > Library > Application Support > Livestream Producer. [Read more…] about Uninstalling Livestream Procaster