Could have sworn that the graphics that display when I change channels with live TV (the channel logo and the program description across the bottom of the screen) once displayed in color.

Now, they're displaying in grayscale. Everything else (EPG, MythTV menus) displays in seemingly correct colors.

Is this likely something about my XF86Config, or a Myth preference, or both, that I've screwed up? What should I check?

This is with KnoppMyth R4V2 on an nForce2-based mobo, with PVR-250. Thanks again to everyone for their help in getting this running. I'm hooked on commercial skip!

if you installed with xvmc then it will not be color

That's it--thanks.