first run flickering is reproducable at 800*480 only, at 640*480 i get no flickering at all. i can switch between 640*480 in the same run of the app and get no flicker and after switching back to 800*480 it will flicker again and show difference, however this is ONLY on first run.

Anytime after the first run after a reboot it is 100% fine.

I have a video showing me switching resolutions and going between flicker at 800*480 and no flicker at 640*480.
I will not upload this yet, but if required I will.

However can I ask some diligent tester to see if they have an 800*480 movie to test with mplayer for the same effect?
edit: doesn't matter.
I made one and I cannot reproduce there.
/me looks for different options.