Platform Missing after Import

[noderunner]

Multiple times now I've tried to import platforms, in my case "NEC Turbo Grafx 16", "NEC Turbo Grafx 16 - CD", and "Sega Master System". The import finishes successfully. I can see the roms inside my Launchbox/Games/<Platform>/ folder, and I can see media files in their respective folders. But Launchbox doesn't display the platform in my list of consoles. I can't actually find the platform and launch any of the games. Re-importing master system a 2nd time did the trick, but TG16 platforms have failed twice in a row. I don't want to keep doing this because it takes hours to re-import due to how slow the media downloads are. 

Any ideas on what might be causing this or how I can fix it? I have a feeling Launchbox might be ignoring the file extensions on the roms maybe? The TG16 roms were in .pce extension, and the TG16-CD roms were in .7z, and I've also tried extracting them all to .bin and .cue files.

When I go to Manage Platforms, I don't even see TG16 in the list even though all the games are there. TG16-CD is in the list but shows zero roms. Both systems showed a correct list of all the roms though when I did an import and downloaded all the media. So I'm confused as to why LaunchBox can detect them correctly for importing and finding the boxart, but can't detect them correctly for launching them or showing them in the UI.