Certain web pages, "advanced" pages like Sky's TV listings or even the google home page, show blacks and dark areas as transparent making them very hard to view. It also happens to pdf's viewed in Firefox and quicktime movies in firefox. The problem seems to be connected to the Win7 aero feature as when this is switched off the problem disappears, but not other application or browser is affected. Images: https://lh3.googleusercontent.com/-uRBoCrR0awk/TnjfoVUB4KI/AAAAAAAAMXU/qIp46IfMqs8/s800/firefox%252520transparency%25252001.jpg https://lh5.googleusercontent.com/-HKxcPtmVwqs/TnjfpoBCAiI/AAAAAAAAMXY/LJdh4APflOA/s800/firefox%252520transparency%25252002.jpg