Vsync Screen Tearing / Scan Line Issue?

This is something I noticed on my iMac after updating to Mac OS X 10.6 Snow Leopard. I noticed a horizontal break in the screen when I was doing any kind of graphic intensive operation. Anything from scrolling up and down on a web page in Safari, to switching screens in Spaces, to bring up my Dashboard or switching users with FUS. By opening a new movie recording in Quicktime X and simply moving the video around, you can clearly see this break is not a random screen tear, but actually some sort of scan line moving from top to bottom in my monitor. I've never seen this prior to Snow Leopard, but I suppose it is possible this is a hardware issue, rather than a software or driver issue. Can anyone else duplicate this on Snow Leopard? I am on a 2007 2.8 Core 2 Extreme iMac with RadeonHD2600 graphics.
I made a video of the issue and posted to youtube if you want to see what I am talking about.
http://www.youtube.com/watch?v=0u2BIubdGu4
Message was edited by: Danny Z

I also get this issue in Snow Leopard when connecting my iMac up to a TV via the apply video adaptor. I didn't get this with Leopard and I don't get this on my iMac display.
I've been through all the video settings I can find (frame rates, display sizes, etc) and each one still has the issue. SL has changed the system preferences for external video so I guess something else may have also changed.

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This guys is having EXACTLY the same problem that I detected:
https://discussions.apple.com/message/10624006#10624006
And his explanation is quite clear
(copied from this post)
Description: Every other horizontal pixel row appears brighter than the alternate, creating a scan-line style effect that also contributes to the washing out of the display. In seemingly random "luck of the draw" machines, lines can either be highly visible or not be present at all.
In displays where it is faint, you may not notice, but once you become aware of it is a real problem if you work closely with your computer, and graphics.
This appears to be the same issue that has been widely reported in the past with Macbook Air computers.
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1 - Glossy, 9C99, lines visible even from three feet away.
2 - Glossy, 9C99, lines about half the visibility
3 - Matte, 9CAC, lines again about half the visibility of #1
I have also had 3 glossies and 1 matte that have not had these lines at all. 3 Unibody 15" MBPs have also not had any such lines. I have also been unable to detect these lines on any non-Apple computers I have observed, nor any of Apple's other models or displays.
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Thanks

Vsync Screen Tearing / Scan Line Issue?

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