After recording my system audio, the audio does not get recorded.
Regardless of what hardware you use, you should be able to record system audio directly from the Camtasia Recorder. To make sure this works, make sure the appropriate option is selected in the Camtasia Recorder.
If using the PowerPoint Add-In, make sure this option is selected:
If you are receiving some sort of error when attempting to record system audio, please submit a ticket and include the error you are receiving.