I have a macbook pro, and mac pro. But this only happens with macbooks, tested with a friend. When you open safari and go to a webpage full of text. If you scroll the page, all the text changes to a lighter color. Anyone seeing this? How to fix?
Do you mean text is bolder at the top half of the screen than the bottom? This would be a TN panel characteristic, as more commonly spotted on the 20" iMac (with it having such a big screen) and is normal. They use this (cheap) technology in the lower end Macs.
Another good way to spot it is to set a medium gray background, this will appear to be a gradient.
iMac here... hmm I did notice a bug once where text would be rendered bold-ish in patches, and scrolling the text out of the viewing area and back in would make it redraw and look normal again. But come to think of it that might've been on my W$#!ows box.