First of all my apologies if this has already been asked in some other thread. I searched and searched and could not find it. My question is about graphics. I have my desktop preferences set to change wallpapers every five minutes. While watching a movie in Quicktime Pro today, I noticed that when the wallpaper changes my movie frames slow down. It's very short, maybe a second or so, after that I watch the movie just normal. Is this normal? Or what could be causing this?