It seems that while I'm in game and press Esc, the game menu shows for a brief second but then disappears. No matter how fast I click, I am unable to use the menu to load, save or exit the game. This apparent bug exists no matter what speed I have the game running, or even if it's paused. I have to Alt+F4 out of the game and lose my progress (figured that out when I encountered the bug but really needed to change my graphics settings). I'm far enough in this particular game that I don't want to exit because I am unsure of whether or not there are autosaves. If autosave doesn't exist, I heartily suggest this be added in a later edition of the game.
OS: Windows 7 Ultimate, GPU: Nvidia GeForce GT 555M, CPU: Intel Core i7-2760QM
Network engineer here, so basic steps are followed as soon as driver updates are available.
Feedback is appreciated on status or workaround already implemented, thanks!