Horizontal refresh lines appearing on Desktop Preview since 10.6 upgrade

I just recently upgraded my system to Snow Leopard, and unfortunately I am now getting TERRIBLE horizontal refresh lines during full screen playback in FCP 7 on my 2nd monitor. It is so bad it is unusable.
When I play back video on with Desktop Preview full screen on my main monitor, the video looks great. I've even plugged the monitors into opposite ports to test and it's definitely not my monitors. The same thing happens on my opposite monitor if it is plugged into the second jack.
I tried playing back the same footage in Quicktime Pro on both monitors. NO ARTIFACTS.
I've also reset PRAM, trashed prefs, etc.
It seems that 10.6 has broken an nVidea video driver and caused a bug in FCP 7 and is causing a terrible refresh line that pokes out in transitions and during bright scenes and contrasty imagery. PLEASE FIX THIS APPLE. I would hate to have to reinstall 10.5 just to use FCP.

I have tried a few things listed here to correct this problem, I think I have figured it out. The steps I took to get rid of the lines that randomly appeared across the screen (desk top) and with in open windows are as follows:
First I ran apple jack on auto mode. You have to start up in single user mode. I did this three times as recommend in another forum that I can't remember the site now.
Second, I freed up some memory. I used appDelete.app and rid my computer of all applications I haven't used or no longer needed.
After the above steps, I reset the PRAM by restarting while holding the option, command, P & R key down, until the start up chime sounded three times.
I did this over a week ago and not only is my system running faster, I haven't had one line appear in any open windows or across the display.
Side note, I recall that the time I started noticing these lines, was shortly after downloading internet explorer, I needed that browser for a job related site that didn't or wouldn't work with Safari or Firefox. After I used that browser for my employer, I never used it again. Shortly after that install, is when I started noticing the lines. I removed that application using appDelete.app and again no lines ever since.
I hope this helps others.

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http://gyazo.com/b58cb0236664e7aef5f9561ad8761ec4
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http://gyazo.com/a27fb2cb9e40c9886b71677fd0443716
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Gotcha !
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Model Name:
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Any new results?
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Hello Eliza,
Thank you for the details of the issue you are experiencing with your display on your MacBook Pro. I definitely understand your concern with this.
I found an article with steps to troubleshoot issues with displays. This article is for internal and external displays, so you can skip any steps referring to an external display. I recommend reviewing the full article, but this step specifically stands out to me:
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http://support.apple.com/kb/ht1573
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Horizontal refresh lines appearing on Desktop Preview since 10.6 upgrade

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