When I imported the latest MAME set, I selected the option to separate into arcade subfolders (CPS-1, CPS-2, etc). However, once import has completed it has only separated them into 2 folders - "arcade", which has 3588 games and "Sega ST-V" which has 39.
I tried the option in tools to create missing MAME/arcade playlists, but after 7 or 8 seconds it says "no missing playlists were found to add"!
No idea why this is not working, and any help appreciated!
EDIT: fixed this; somehow the playlists didn't appear initially. After a restart they appeared, and I moved them to the arcade plaform.