It's always worth 'nuking' all your Unity files and trying again. So can you give this a whirl? 1) Clear your browser cache 2) Clear your Unity Cache here -> http://webplayer.unity3d.com/setup/ 3) Completely uninstall and then reinstall Unity here -> http://unity3d.com/webplayer/
XXMeisBossXX YOUR THE BEST COMMENTER! IN THE WORLD!!!.....maybe!!! ;)