Artifacts/Garbage when viewing via an AviSynth file

[HartleySan]

I'm using CamStudio with the CamStudio Lossless Codec to capture video of my computer screen.

When I watch the video directly that was recorded by CamStudio, it looks flawless; no issues at all. However, when I watch it via an AviSynth script, I get all sorts of weird artifacts and garbage throughout the whole video. For example, a majority of the screen will turn black, but the CamStudio window will become a negative of the original window, or you can see all sorts of trails with the mouse movements, etc.

Obviously, I don't want this to happen, nor do I have any clue why it's happening. Has anyone else ever experienced this and know a solution? Thank you.

To provide some more info, here's my AviSynth script in its current state (it's only one line):

AVISource("20120811_1007_56.avi")

Whenever I load that script into VirtualDub or Media Player Classic, etc., it looks really weird.

Thank you.