So ran into this bug which has had my head banging against the desk for a few hours.
I will walk through the process I took first:
1. Under saturn, I highlighted and deleted all but 2 games, as I wanted to do a bulk edit of the source file and couldn't see a way to do so without re-adding the games.
2. When I click to import my folder with all my saturn games, even with 'force duplicate' checked just in-case, the 'ready to import' screen shows nothing. It literally shows just 'name' and 'file', and a grey area.
3. I figured it was due to other associations of some sort, so I deleted the remaining games, deleted the saturn emulators, deleted the saturn images and manually deleted the saturn metadata for all games (as they were still there). I put 'none' on the platform side and it had no games listed there, as well as checking listview for any games not under any system.
4. I closed down and re-opened launchbox and attempted the bulk import again, and have the same result with it not detecting any of my saturn games. I attempted changing emulators and that didn't help.
5. Now here is the weird part. If I individually add a game file, it detects and adds it fine. But if I select the folder import, it doesn't. Just incase, I re-tested the bulk folder import on another system and it works fine - so confirmed this is due to the previous delete of the sega saturn games.
Any ideas?