There is a known issue for some users that when they first open MediaShout 5.2 build 105 and click on a song in the Lyrics Deck, their entire library disappears. Good news is that nothing has happened to your library. MediaShout is not initializing correctly. You can know that this is the case for you if you see both List and Page highlighted.
1) Before you click on any songs in the deck, click on either List or Page in the middle of the Deck to finish initializing the library.
2) Continue selecting songs as you normally would.
As a note, this has been fixed in build 108, so update to the latest release to fix this issue permanently. Thanks and be blessed!