Don’t worry, it’s not a

Don’t worry, it’s not a bother. That sounds like the right place to install the filter. Have you noticed the glitching only since you installed MoCA or was it happening before then? Has your cable modem service been okay?

To monitor your frequency, signal level and signal-to-noise you can take a look at it through the Tuner status web page or using the Ceton diagnostic tool which installs a section in WMC to monitor the information. You’ll need to refresh the page to watch it over time. You’ll want to make sure the signal level is no worse than -15dBmV. If the signal-to-noise is not at least in the thirties, there will likely be glitching.

Here’s an example of the web page which can be easily accessed by opening Windows Explorer, Click on “Network” in the left pane and then under “Media Devices”, right-click on the InfiniTV of interest and select “View device webpage”:

Your description of the video card issues does seem like a possible culprit. Maybe you can try completely uninstalling the driver and then reinstalling it. It would be best to keep ESVP checked.  Verify your card is not scaling the video to some resolution other than your display native resolution.