Video errors while playing World of Warcraft with tv tuner overlay

[paruhd0x]

Whenever I play world of warcraft and opened my tv tuner and use overlay feature to put my tv in a small box in WoW I get weird graphical errors that continulously happen while the tv tuner application is on.

Below is an example video of what happens, (the black box is the tv tuner video that doesn't show up to FRAPS recorder)

Thanks for any help/advice that you can give.

http://paradoxlair.com/ingamevideoerrors.wmv