MASKOAA and kinetic758, thanks very much for your input. I feel much better knowing that I'm not the only one experiencing this. I looked at it closely last night, and that small cluster of pixels are 100% functioning properly outside of the scroll bar. All colors are showing up beautifully.
However, this brings up an interesting question: do I have to worry about IR (or possibly even burn-in) of that small cluster of pixels if I run the scroll bar for an extended period of time? In other words, will I run the risk of those pixels then appearing during cable broadcasts, bluray viewing, or xbox360 gaming if the scroll bar runs for too long (or often)?