I made several tests
- Using MESSUI with the parent system, the rom that makes problems (Super Mario All-Stars (Europe)), has that "Game Pak is not suited bla bla bla..." message. This is probably coming from Nintendo to prevent US owners to play EUR Games in a US Snes. Because not all the games have that message. It's up to the developper to make games non-playables from one system to another. - Using MESSUI with the clone system. All is working well with the rom. Game is launching.
So nothings wrong with MESS, this is something with the frontend I'm using (Emuloader), that does load the parent system all the time and does not switch between parent and clone when it's necessary.
I just realized that many emulators (Snes9X, Nestopia....) have an option to automatically use the NTSC or the Pal depending on the game you play. Maybe I'll ask the developper of Emuloader.
Thanks for your patience !
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