Having a strange start button problem with my MM. For some reason, it takes several button presses to start a game initially. Sometimes as many as a dozen. The weird bit is that the switch doesn't seem to be intermittent - in the switch test, it works fine, every push. Also, holding it down shows solid in the test, no flickering. And once a game is started, adding extra players works fine, every time.
In fact, if I remove the wires from the switch and manually make the connection between green and yellow, I get the same results: it takes many connections for the first one to start a game, then it's fine after. Entering test mode and then back out to game mode seems to "reset" the behavior, and you have to hit the button a bunch of times again. I even tested it with the balls out, so that hitting start triggers the "locating balls" cycle instead of starting the game... This way, I verified that the first button press takes many tries, and then it works flawlessly. Everything I've tried seems to indicate that the switch & wiring are fine.
Is there something in the switch matrix that would account for this? Or am I missing something stupid? The other switches in that row and column work fine - but then again, the start button works fine in test mode as well. (n.b. - I currently have the machine in pieces, so there are some other switches that are currently not attached to the game. But I don't think that should make a difference.)