When using S-video, I have 'stretch using hardware' checked. 'Switch resolutions to fit' and 'switch color depths to fit' are un-checked. All games should match the resolution of your desktop.
Tried that thanks. No luck.
I think the total relevant set of options are:
Display Tab
Run in window (on, off)
Start out maximized (on, off)
Enforce aspect ratio (on, off)
Clean stretch (None, Full, Horiz, Vert)
Advanced Tab
Stretch using hardware (on, off)
Switch resolutions to fit (on, off)
Resolution size (auto, 640x480, etc.)
And again I have tried about every combination of things here I can think of...
It really must be something simple I am missing.