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If you are able to view [[Managing the Flash plugin|Flash]] videos (e.g. at YouTube), but cannot view them if you try to make them full screen, you may have a problem with the [[Managing the Flash plugin|Flash]] player and your video drivers. The following article describes how to work around this problem. If you are unable to view videos at all, see [[Video or audio does not play]]. If you are unable to view [[Managing the Flash plugin|Flash]] content at all, see [[Managing the Flash plugin]]. {for linux} = Preloading the '''libGL.so.1''' library = On Linux, this problem can often be resolved changing the command used to launch Firefox so that a graphics library is loaded along with Firefox: # '''Ubuntu (and other GNOME-based distributions):''' Click on the {menu Preferences} menu and select {menu Main menu}. The Main Menu window appears. # Click on the program group called {menu Internet}. # Select {menu Firefox Web Browser} and click on the {button Properties} button. The Launcher properties window appears. # Insert the string <code>env LD_PRELOAD=/usr/lib/libGL.so.1</code> '''before''' the text specified in the '''Command''' field: <br/> <br/>[[Image:fb604c309992ec8d1e1b5cabb49d593e-1249820004-202-1.png]] # Click on {button Close} to dismiss the Launcher properties window. # Click on {button Close} to exit the Main menu window. If the problem is not solved, try to disable hardware acceleration (see below). {/for} = Disable hardware acceleration = # Make sure you are using the latest version of Flash. To check your version and to upgrade, see [http://www.adobe.com/products/flash/about/ Adobe's instructions]. # Navigate to a page that shows a video that you can't view in full screen. # {for win,linux}Right-click{/for}{for mac}Hold down the {key Ctrl} key while you click{/for} on the video player and click {menu Settings...} in the context menu. The Adobe [[Managing the Flash plugin|Flash]] Player Settings screen will open. # Click on the icon at the bottom-left of the Adobe [[Managing the Flash plugin|Flash]] Player Settings window to open the Display panel. # Remove the check mark from '''Enable hardware acceleration'''. <br/> <br/>[[Image:fpSettings1.PNG]] <br/> # Click {button Close} to close the Adobe [[Managing the Flash plugin|Flash]] Player Settings Window. If this workaround allows you to view full screen videos, you should try to update your video drivers by visiting your video card or computer manufacturer's web page. Also if any of you use Compiz you have to go to Compiz Config manager > General Options > then tick "Unredirect Full Screen Windows". Worked in my case. <br/> <br/> '''''Based on information from [http://webupd8.blogspot.com/2009/07/how-to-fix-full-screen-flash-videos-in.html Web Upd8]'''''