Database maintenance is being performed, and to make the system even more future-proof, UUIDs for some variants are changed. Some variants (which should not have been included in the first place) will be purged as part of this update (this includes Quarterback ADFs, and virus-infected variants). During the maintenance, you might run into some temporary problems.
When the update is done, the “database version number” will be incremented, which will cause the Launcher to re-download the entire database. So you shouldn’t notice this much except for one extra long refresh operation.
Updated: The update process is now done. You should use the latest development version of FS-UAE and refresh the game database 🙂 Due to renaming of some disks, you may seemingly have “lost” savegames saved on floppies from the game database. If you miss a savegame, you need to rename the corresponding floppy .sdf file in the save state directory.
Second update: There remained a problem with starting WHDLoad games after the update. This has now been fixed, just make sure to refresh the database!