There is a button, but that's not likely to be the problem if it works on some machines. Pressing "5" on the keyboard will do the same as the button, so that's a good test.
I'm guessing he means hi-score initials from previous players, which would come from the nvram. If the game hasn't been played before on his machine, its nvram probably doesn't exist yet, and sometimes that makes the game misbehave. It's usually sorted by backing out of the game, which will create the nvram, then loading it again.
If you can give me an example of a game that doesn't work, I'll see what I can do.
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