I attempted to upgrade my MAME setup from 238 to 251. That went horribly. I wound up with multiples and anything new added had no images attached to it at all. So I blew it all out and started from scratch. Installed and setup LB the exact same way as before. Then I noticed a lot of games didn't have images for them. So I started to compare my existing install (before it blew up) with the new one and this is what I found:
Old .238
5660 Games
Images folder - 21.2GB - 59,953 files - 766 folders
Screenshot - Game Title folder - 6,357 files
New .251
5814 Games
Images folder - 18.76GB - 34,540 files - 777 folders
Screenshot - Game Title folder - 2,636 files files
That's a massive reduction in the number of items, especially the Screenshot folder. If I go to a game with no image (existing install has an image) and edit that game then go to download media, it says it can't find anything. Where did these images go? Why do they no longer have images for them? I'm assuming I can just copy over my old Images folder with no issue? I brought over one image and it populated properly which I thought was interesting. Are these snatched up based on file name structure?