Sometimes, when I am surfing, and I scroll up or down with the Magic Mouse, or even just reach for the mouse and drag it towards me, the web page I am on will magnify very large and I can't seem to get it to reduce in size again. I have to close the page and re open it. Today, it even happened when I was on my desktop. After the screensaver started, and I moved the mouse again, the screensaver stopped and the desktop was normal size again. Anyone have any thoughts?