AVKaranov: How do you get out of the "boss mode"? It's running in the background just fine, but I can't get the window to respond anymore. I'm running Win7.
Guys, I did it! Same thing happened to me and I found this thread. Heres my workaround on Windows 10:
Opened task manager, found the app. Right clicked, click expand. Then click either "bring to front" or maximize. What happened to me here was that a tiny little window opened. That was enough though. I right clicked and tried to click save. You'll have to move your mouse up and down far to the right of the little in game menu that appears when you right click. Fortunately its highlighted when selected. When the save menu appears, do not click. type anything, then press enter. That should save the game! then you can just end task and restart the game to get back to playing :D
Hope this helps you guys!