A user who had put a galaxian board running the multigame into his pacman cab noticed that Super Invader Attack did not fire properly, working about once in twenty button presses.
He had used the Start button as the fire button (as well as Start), which works in most of the games, but in the case of Invaders it registers the fact that Start has been pressed and then skips looking for any other buttons.
A quick fix so Invaders will no longer check for Start buttons whilst the player is in the middle of a game and it now works as expected.
In addition, the Return to Menu was not working in the middle of a game using the dedicated menu button. Now this was intentional if you were configured to require coins to play, but it now works immediately if you are on freeplay.
Get the updated binary from the normal page here