If I "Quit" the Arduino IDE then I see the same behavior you do. The last file open on launch.If I "Close" the last open file, I kept a prompt saying the IDE will Quit. In this case, the last file doesn't open.So the IDE is trying to open whatever files were Open the last time the IDE exited. Close all windows/files and they won't re-open. (This seems to me that it is the same behavior from pre-0022.)
That's different then I get, close, quit, upper right hand window X, however I close the IDE it always opens with a blank sketch window?
Windows: CTRL-Q or File -> QuitMac OS X: CMD-Q or Arduino -> QuitAny open files will be re-opened when Arduio IDE is started.Windows or Mac OS X: Close Window / FileThis file will not be re-opened when the IDE Lauches.