id summary reporter owner description type status component version resolution keywords cc guest host 8553 Going fullscreen switches desktops oxoocoffee I installed vbox 4.0.4 on MacBook pro early 2011 Sandy Bridge 2.7GHz. There is a separate ticket #8549 for a different bug that contain log file. This problem is related to trying to move XP host to external monitor and going full screen. When entering full screen, vbox automatically goes to primary MacBook Pro screen. After a while I was able to figure out that I need to assign which screen I need to assign to. It was not so obvious until I switched to seamless mode that the were was option under View switch screen I need to assign it to. I was not able to see View option in windowed mode. Just wondering why I have to and if I really have to select from menu which screen I want vbox to be assign to. My natural expectation was just move host to screen that I want to go to full screen to and than enter full screen. I guess permanent screen preassigning is a good idea but it I do not do so I should be able to go to full screen in the screen which I am working with. defect closed GUI VirtualBox 4.0.4 fixed Windows Mac OS X