I've tried both.. i.e. standard ROM importer, also via the whole arcade set. I've tried leaving them in the same folder (i.e. MameUI roms), and copying to the games/arcade folder.
I'm going in loops, can't figure out why I have perfectly working games via the mame ui, but the same games won't launch from launchbox.
Am I using the wrong version of mame? My roms seem to be 2004 according to this (I'm now trying the latest mame - not the ui to see if it makes a difference).
If it sheds any light, these roms don't work in the latest mame, but only my version of mame ui 2017.
Do I just start again from scratch? Download the latest mame and roms? I'm sure everyone else isn't having this issue so must be something up with my setup.