@kcpinhead : Oh, so you are one of those guys. Yes. I know that it happens still, on a very few selected computers it seems. Unfortunately, after my latest changes, it doesn’t happen here any more. At least not on my main pin. On the desktop machine, same OS, same VP, Pinmame etc. I used to see it, often, but I haven’t been able to reproduce it with the leatest version. You might want to look in the script, there is a few variables, marked ‘ Thalamus, where adjusting the speed might help you out solving it. You might also want to play around with the size of sw52 if I remember correctly. It is a opto that should be broken.