I'm trying to render a widescreen video using the 512k wmv codec. No matter what I try, I always get black bars on top/bottom AND left/right.

I've tried it letterbox'd, and non-letter-box'd. I've tried doing it with widescreen as the preference, and 4:3. The only difference that I can get is this, with Do Not Letterbox and 4:3 as the preference.

All I want is a 512k codec'd widescreen video that plays at full screen, instead of the bars on the sides. Using the 4.8mbps wmv codec doesn't cause this problem. Any help is appreciated.