I may have a fix for the glitchy video and audio happening to many people.
Assuming that you meet or exceed the requirements to run the Roxio software, your PC or Laptop is not overheating, your cables are in working order, your Roxio unit is not faulty, and you have updated the software and drivers, you may need to try tweaking your Graphics Card settings.
I my case I needed to go into the Nvidia Control Panel and change some settings in the 3D Settings - Manage 3D Settings tab.
After some trail and error and testing, I found that with the right settings, the Glitchy Video and Audio are solved.
Below is a video explaining this further.
For ATI Graphics Card users, please refer to this video.