Hi Phoobie,
I appreciate the time and effort that you took to troubleshoot the issue. I would like to inform you that it would be better if you contact Hauppage support for the same. You can check the direct link to contact them below:
I understand that except the Hauppage WinTV system is working fine otherwise. If you have any further queries please feel free to contact us.
Thanks and Regards
Sandeep P
#iworkfordell