I've noticed others have had similar issues but I haven't seen this specific answer. For some reason many of my worlds no longer show in the add a world drop down. I didn't realize until some saved games didn't even have schools any more. The names were all pre-fixed with file names, etc. Basically saved games were a mess if not in this drop down.
Anyway, purchased games I can re-download, but that's a pain. I have every file for these worlds except the download because I don't like to have them all show in the launcher. (Hind sight, I should have moved them to another folder vs. delete.) I have installed worlds, saved worlds, world cache, etc. with these worlds but it appears they need to be showing in the drop down for them to be recognized by the system and work right.
Are there any shortcuts that I can do using my installed world files? Some of these are custom worlds that I downloaded which would mean I need to go find them if I want to keep using that game. Seems like something always happens to a saved game once I finally get some generations built up.
