I use Koepi's binary and I can't seem to get simple xvids from skipping. I have a fairly fast computer (2Ghz Pentium M Dothan with 1 Gb of DDR Ram) and I'm puzzled as to why my xvid's skip with fast motion as well as some frames are pixelated.
You are talking about playback? Could be due to the way they were encoded (badly). Koepi's should be fine for playback. A little old now (1.1beta2), but ICL compiled so it should run fast on an Intel CPU. You could try mplayer or VLC for playback.