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The message should probably be too many ips instead of too many roms... ! Anyway... !

As usual it seems you wait for a release to test something like that... And yes it's quite astonishing that all these files work without any conflict ! The normal max number of ips files was 20, which seems already a lot considering the conflicts. With 30 it's still not enough. With 40 it works, and without any conflict. The fix is very easy to do, if you had tested that before the release you would have it already... ! It's an interesting combination for others I guess... !

Excellent, you didn't waste anything here, glad it works anyway !

One good practice is to dowload MameUI from Progetto snaps and then add the extra folder and files you need, as Robber stated...

You need to extract everything that's supplied. Doing just the exe means you miss out on improvements to software lists and to shaders, and probably other things too. Your ini files, cfg files and other transitory things are not affected.