Hey burningman. Might want to flip that minute hand again. I think you had proper function before. Hour should change when the minute hand is on the 1/2 hour. See excerpt below.

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Also, had all the described problems, and own a box of old OEM clock boards. After several years of dealing with those boards I bought the Ingo board. Can't say enough about how reliable it is. Pleasure to play the game without holding your breath every time the clock turns on!

Is it possible that the minute hand is not completely and reliably interrupting the sensor? Seems likely since it functions when you manually block it. In my experience it takes very little twisting or warping of the clock hands to affect the performance. I have replaced both hands before with improvement. You could try reshaping the minute hand a little and see if that helps.

I'll plug a new board again. I rebuilt the OEMS several times and had them work; yes its a great feeling. But went to one of Ingo's boards nearly a year ago and it's not even glitched one time since, and the game gets played a lot. Absolutely one of the best technologies out there, ranks right up with the GLM ball trough boards for trouble-free play. I love mine, just waiting for him to send me some replacement LEDS so I can swap out the cool whites for warm - want to get back to that more original look, but that's just a taste/cosmetic issue and he has so many choices for that!
Great product, great communication. Can't go wrong and you'll be glad you can turn on the game and not spend the whole time watching to see if the clock is working correctly.

You'll see 4 posts up where I praised Ingo's board 2 years ago. Just want to update that it remains flawless after a lot of additional play - never an issue. Still think it belongs in the pinball mod hall of fame as one of the greatest mods out there!