I have the games stored in a folder my OneDrive folder, they are downloaded locally. Launchbox is located outside of my OneDrive folder, under my user profile. The original games where BIN and CUE files. I had found some new CD32 games that are LHA file format, and I was trying to add these when I got the blank screen.
So I did a test, first I imported a single CD32 game that consisted of BIN and Cue files and it was found successfully. Then separately I did about 5 LHA files, they were found successfully. So I'm led to believe that one of the new LHA files is breaking Launhbox during importing somehow.