btw, I'm not sure if you can load a container file the same as a default.xex via file manager as I've never tried it. another option you have is to set up a link between FSD (Aurora probably has this option to) via http. I don't use Aurora, so I'll just explain this in FSD. you have to enable the option (http), then choose a password and username (think the default one is xbox). type the address of your 360 into the address bar of your pc while in FSD, and it will take you to a page where you can access the database. log-in, then once you're logged in, you can check the location that's being used for each game, so check the xbla ones. see if they're correct. it sounds like your database is corrupted somehow (like the game location is wrong or it's not finding the container file(s)). it may have happened when adding or deleting a game. there was a time when my entire database got corrupted out of no where, so I had to redo the whole thing.
I'm not sure if you still need AuroraCrashPatcher.xex as a plugin, but something changed with unity back around March or April, so a lot of people's FSD and Aurora (affected both) were crashing when downloading artwork. that was happening to me when I was adding a couple games. using the plugin (add to your launch.ini) worked. I"m not sure if that issue has been fixed. the FSD team has disbanded, and I'm not sure if Aurora still has updates.