While scrolling on certain webpages and documents, I get a rippling effect about 2/3's of the way down my monitor. Safari/firefox/preview...it doesn't matter. Never happens when I do the two finger scroll. Mostly happens when I grab the scroll bar on the right and move it up and down. Is anyone else having this issue? Software/hardware? Resolution? Thanks for any help! Sucks b/c the computer is otherwise perfect.