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Hi ademcc,
your es_systems.cfg looks definitely fine and I’ve switched also to Retropie 2.1 so for sure mame4all is working fine. I have not so many troubles with my romset to be honest. Some roms lack sound or doesn’t launch but only a handful of them.
You talked about 0.37b11 romset, which is not supported. You have to stick to 0.37b5 romset (Google is your friend :)). Even if there shouldn’t be many differences between the two romsets it’s best to follow the specification! If mame4all tells you that files are missing, it’s sure 100% that it’s not the good rom for this version of mame. Did you try also the various “sets” (set 1, set 2, world, bootleg) for a given rom?
All in all you have to be sure you’re using the proper 0.37b5 romset.
hope this helps again :)