Hi, I am also having a problem with entering fullscreen mode. I have a Mac OS X, and of course, as everyone is reporting it crashes when I enter fullscreen mode. My problem is, that the file "dosbox.conf" that is supposed to be automatically generated the first time that you enter DOSBox does not appear to be getting generated. I am therefore unable to change the configuration so that I can enter fullscreen mode. I have tried removing DOSBox and downloading it again, but nothing seems to be solving the problem. Any thoughts or advice would be greatly appreciated. Thanks in advance.