Preface: This is on a MacBook, running 10.4.7 for the longest time, but upgraded to 10.4.9 last month. My 'iTunes Artwork' screensaver has suddenly decided to not work anymore, as you can see in the screenshot. The artwork was obtained through iTunes. It's been working perfectly on my iPod and iTunes during 10.4.7 and it worked perfectly after 10.4.9 as well. It just decided I had no artwork at all today even though everything is still working in iTunes.