Here's the whole folder. Thanks a bunch for checking into this for me :)
[Edit] So just deleting the whole StreetPass folder fixed everything. I can't imagine what's causing this or if you happen to know a way of keeping it without it destroying foobar. Doesn't really matter either way :D
It wasn't necessary to play it. Merely having your entire library in the "Media Library" folders list is enough for everything to be opened and scanned on startup.
You can go ahead and delete that one file, though.