Howdy-
I haven't an answer for you directly, but there is a MaLa forum here, where you'll get a good response:
http://forum.arcadecontrols.com/index.php/board,43.0.htmlWhenever I have company playing my game, I go into the MaLa settings & click the checkbox that says that a certain keyboard key must be pressed to access the options menu, rather than a mouse right-click to make the little pop-up menu appear. Then, I seat that certain keyboard key to be one that's not available as a button press or joystick direction on my control panel--that key's accessible only by opening up the coin door w/ a key, pulling out the keyboard, & pressing that key.
That should help prevent future goofs. I also make a backup of my MaLa directory every now & then, in case I need to restore it.
Good luck.
-Jason