Green screen filter and scaling down distorts image?

I captured footage from Digital Video Camcorder NTSC ZR30 MC (standard definition camera 2001?) through firewire connection. Footage was recorded in 12 bit rate. Captured in equivalent DV NTSC 32 kHz. Edited the footage using green screen, scaled down to about a quarter of the frame and used oval shape video generator.
Using FCP 0.6. After rendering all edited footage, it plays back digitally distorted (digital lines constructing the image are out of sync). When exported through Quick Time Movie the image remains distorted.
What can be the cause of that?
Please help,
Hazel

When you slow down footage you are creating frames where there were none before. I'd suggest you do this in a two step process:
1. Slow down your footage and render it. export selfcontained movie, do not recompress all frames.
2. re-import the slowed down footage and apply green screen filter.

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Green screen filter and scaling down distorts image?

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