When playing in fullscreen mode, either by toggling the option in the menu or pressing F11, and attempting to minimize the game or allow it to run in the background by pressing the start button, Alt-Tab, or when another program pops-up in the foreground, the game will always minimize to whatever your default window size is and any in-game display will be solid white, and clicking anywhere within the box or trying to minimize or close the window with end with a message that "Java(TM) Platform SE binary is not responding." Waiting will not eventually allow Java to recover and with closing you may occasionally lose a minute or two of progress. This error does not occur when exiting fullscreen by toggling the option or pressing F11.