If it detects MVS hardware then it relies on the Freeplay dipswitch setting of the board. I'm guessing you're running a UniBios and using that to switch to AES? My guess is that it cannot mask the hardware flag for MVS, which is what I'm reading. I suppose in AES mode it doesn't show "PRESS D FOR OPTIONS" on the title screen either?
Simplest thing to do is to switch off free play on your MVS. Credits are supported.
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Hey, thanks for your reply!
You are right, I am using Unibios. It is actually happening with console mode "Arcade". That issue is not there with my other games, so I guess it's not related to hardware switch settings, I will check it nevertheless. And if I set the console mode to AES, I am sadly not getting PRESS D FOR OPTIONS. But no problem, I will survive it :-) Thanks for your hard work!!! We love it!