Scrambled display when I use the trackpad to scroll up and down in Safari

Whenever I use two fingers to scroll up and down in Safari, the display gets scrambled. It gets worse, the faster I scroll. The nature of the distortion is that sections of the display are duplicated horizontally which "covers up" the section where the duplication takes place. This does not happen when I scroll up and down using the arrow keys, or if I scroll with the arrows on the right side of the browser window.
Another thing I have noticed is that some videos I watch online have intermittent white sections flashing in.

It is certain that some people are having problems, all I can confirm is that my 2.0GHz MacBook does not seem to have this problem.
However, after having looked at this thread and another link it seems that a lot of the posts about problems are coming from users of the MacBook Pros and the 2.4GHz MacBooks. Thus, this makes me wonder if the CPU speed might have something to do with this issue. Along with the CPU another issue might be heat (which would seem to be a greater concern with both the MacBook Pro and the 2.4GHz MacBook) and whether the affected systems are equipped with more than 2GB DRAM and whether than DRAM is third-party or from Apple (i.e. these problems could be caused by issues with the DRAM).
Of course, no one can yet say where the problems may be but system "overheating" and/or DRAM could be involved. When I write "overheating" I'm not suggesting user abuse, just that this may be a temperature sensitive issue.
For the record my MacBook has all of the latest firmware, trackpad, and system updates and is the standard 2.0GHz model with Apple-issued 2GB DRAM and 160GB HD. Below is my hardware overview from Apple's System Profiler:
Model Name: MacBook
Model Identifier: MacBook5,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 3 MB
Memory: 2 GB
Bus Speed: 1.07 GHz
Boot ROM Version: MB51.0073.B06
SMC Version: 1.32f8
Sudden Motion Sensor:
State: Enabled

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Scrambled display when I use the trackpad to scroll up and down in Safari

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