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Easy : it's an UNINITIALIZED input, the previous game just initialized it... ! No no, I won't include different default inputs based on how many buttons are used. The current idea can be used for any game with up to 6 buttons, seems good enough. If someone wants something different, customize default inputs or switch to custom inputs is enough...

And finally found after a long search ! It was one of these bits from the input ports which looked like they were unused, so usually I don't even bother to tell they are unused since we have all the controls mapped in the test mode. Well there was no input directly linked to this one, but if it became active, it prevented this special move from the right side!!! I don't know exactly which bit did that by the way, because I cleaned up quite a few of them, but it can be found for someone interested... maybe there was a reason for that, something which was connected to test special moves ? The big surprise is that it happened for you in windows and for me in linux, everyone could do it. It was just an uninitialized input, and its bit turned active which should have had no effect normally, but it had this very weird effect. It's a good lesson for me, next time something so weird happens, I'll start by double checking the input ports... ! While looking into this I had a closer look at how the rasters work in cps2, and they are probably easier to emulate than the neogeo ones finally... just an impression, but anyway I am not sure I want to dive into this now. Anyway good thing to finally have fixed this !