go to AMDzone main page, after page loads, slowly scroll page, close to the bottom of the page, on the right side there i see two rectangles with mixed colors in it. if you change focus and come back, or scroll up and down fast boxes disappears. But appear again with another smooth scroll. i am not sure exactly how to reproduce it . Mozilla/5.0 (Windows; U; Win98; en-US; rv:0.9.9+) Gecko/20020319
Same problem here, but only one rectangle and it is black. Strange.
The problem happens when the page height overflows 65000px... Over to compositor; we already have a bug on this.
*** This bug has been marked as a duplicate of 126592 ***