Originally Posted by EcstaticRarity
I've got the same problem too. I've uninstalled/reinstalled several times using your instructions. No dice.
I even upgraded from Lion to Mountain Lion to see if it would make any difference. It didn't.
I'm using version 20.3.8 of Procaster.
Have you tried the "Add Source" Button on the bottom of the audio mixer to see if you can add another source?