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Stacking 3 gmp4-files using Avisynth and VirtualDub, results in wrong colors and distorted files

I need to conduct the seemingly simple task of stacking 3 files next to each other. They are all the same: .avi Container, 320x240, 4:3, 25 fps, GeoVision Advanced MPEG-4 GEO codec. I installed the GeoVision codec (http://www.geovision.com.tw/english/5_8.asp# - select "other utilities"), so my system (windows media player, media player...