I've got a MBP and an external monitor from Samsung. I've Lion on my MBP. The monitor is my main screen, so the screen of my MBP is now a "second screen". When I have a program running in fullscreen mode, like safari or anything else, on my Samsung monitor, there is a grey background on the screen of my MBP. Can't I run a program in fullscreen on one screen and an other on the screen of my MBP at the same time? I hope someone knows the answer, because I haven't found a solution on the internet. Thanks in advance!