Hi, Ever since I bought and installed OS X Lion from the App Store, some strange occurrences have been happening on my late 2010 MacBook Pro The most annoying of these is my applications seem to become transparent to the desktop in a checkered pattern and then reset themselves when i move the touchpad again. The attachments are screenshots of what im talking about. On the second one you can clearly see the checkered desktop showing through my Google Chrome window. At first i thought this problem was only Chrome but the first picture displays it is also occurring in iTunes. I have also had it appear in Photoshop which is extremely annoying as it disrupts my work. Please any help would be appreciated.