I gave it a go on a family member's 3DS, same issue for a few times. Ended up installing it twice in a row and that seems to have done it. Sounds like an issue with flushing, I think there's a ControlArchive call which can make sure stuff gets written to the savegame, although that should already be there with sploit installer.Yeah that's the issue I couldn't figure out. Just retry installing (as the installer says)