Hi Drew,
Can you make sure you have the latest version 1.4.4? You can download it from here:
http://jaksta.com/download/mac/jaksta-media-recorder
If this does not help, can you try viewing a couple of videos from YouTube, and then send us your log file as described here:
http://support.jaksta.com/discussions/topics/6000009509
Thanks,
Ben
Jaksta Support
Drew Halfmann
Tried in Youtube and PBS