This is a fairly common problem and there are various posts and suggested fixes to the problem scattered around the internet. I literally bought my PC to play Civ 5 and I cannot for the life of me get it to launch in fullscreen mode using Div X. It used to when I first installed from Steam, and I am 99% sure the source of the problem is my resolution settings. I found a random post that posted the native resolution for Civ, changed it, and managed to get the game running in full screen once again, but it has reverted back. Can someone please post the native resolution for Civ 5 that they are running on fullscreen (preferably on a 720p TV). I have the problem that it launches, but when I try to change in game all the options in the video section are missing (ie relating to quality) and selecting full screen just keeps the game in window. I have spent ages trying to figure this out. Running windows 7 with Samsung 720p HD TV, Radeon 7700 Graphics card 8 gb of RAM. Have tried messing with the log (you know, the notepad thingy; recent convert back to PC from Mac) to change to full screen, but doesn't work. As say, have fixed before by changing resolution so sure that is the problem. Thanks in advance.