Live TV Shows Only in Corner

[faithless21]

Hey everyone, sorry if this is a repost, but I searched all over and couldn't find anything related to my problem.

I just installed the RC3 of Mediaportal, and have gotten almost everything working (at least enough to not bother the people who are using the HTPC.) However, when I go to watch TV, the picture appears only in the top left corner of the screen. No zoom options change this, other than alter the look of that little picture.

I've changed the codecs used, drivers for both my video card and tuner, tried to see if the problem persisted outside of MP (to no avail, WinTV wasn't scanning channels on my card.) The problem also doesn't exist elsewhere, such as watching videos from within MP.

Any help is really appreciated guys, this one's had me yelling at the TV for about two hours.

For reference:

Asus A8V-deluxe
Athlon XP 3500+
Geforce 6800 GT
Hauppauge WinTV PVR 350
Twin 320 GB HDs
Mediaportal 1.0 RC3