@dankcushions said in Some FBA roms not working in latest build of Retropie/LR-FBA-next?:
fba-next recently got updated to a new set, with a new neogeo.zip, which might explain your problem.
@dankcushions and @Floob you nailed it. I actually had a hunch that it might be my neogeo.zip. I had all the right files in the neogeo.zip, but I found a complete FBA .2.97.38 romset (I previously just downloaded some FBA roms from website, still the correct version though), and looked at it's neogeo.zip.
When I placed that neogeo.zip file on the pi3, everything worked! Problem solved. I drilled down even further through trial and error, and found the bad file in my old neogeo.zip was "sm1.sm1". If I replaced it from the new neogeo.zip, that solved it as well. So frustrating, but I figured, as did @dankcushions and @Floob, that it had to be something with the neogeo bios....
Thanks guys, truly appreciate the help!