Fading colors when scrolling

So at first I thought my eyes were going. But I guess not. Sometimes when I scroll macrumors things start to fade when I let go of the scroll bar. Clicking other window corrects this. Or moving it to my other screen. Any ideas? Is this another x1900 issue?

 

I don't think so. As the icons for the threads do it as well. And it comes and goes with scrolling.

Also it appears to only happen to mac rumors when viewing the list of threads. Not when viewing the list of forums. It also only works on my left monitor. It happens everytime.