Cannot add songs from my PC to library
I updated to 11 a couple days ago, took a while to get used to it but it's working okay. Till now. I was able to add songs to my library in the usual way, by dragging them from a folder into the library window. I drag and drop but it will not show up at the bottom of the library list. I tried adding the other way, using the File menu and navigating to the folder and doing it that way. Still will not add to the entire music library in the window. However I CAN add songs to playlists by dragging and dropping in the playlist. But then the song still does not show up in the library, which doesn't make any sense, since tracks in the playlist must be part of the library, right? I rebooted iTunes, rebooted my PC. Still does not work. Quite infuriating. Did I change something in the settings or preferences, or did iTunes suddenly go screwy on me?
Windows 7