Using the current version of LaunchBox, I imported my MAME set with the default settings. It worked fine for the most part, but I noticed the original Space Invaders did not import. If I try to import it by itself, LaunchBox seems to refuse to add it. I've unchecked all of the "Skip" checkboxes when importing a MAME ROM and selected "Import All Clones." Still, that doesn't make it happy. I've verified the ZIP file is fine and I can play it A-OK in MAME by itself.
Any ideas why Space Invaders (MAME directory name: invaders) won't import?