Lyrics blank on workspace and presenter screen - WHY?

We've had an issue come up several times over the last few weeks and don't know why it's happening. We found a workaround but we shouldn't have to jump through hoops to get our lyrics to show up.

On the workspace/desktop, we see a bunch of blank slides where all the lyric slides should be. We go in to edit the individual slides and all the lyrics are there, we exit/launch - same thing, nothing. We go into edit for the whole song, everything looks good - we relaunch - same thing.

Here's the workaround, we go into edit the entire slide group again and this time select change song and reselect the song from the library then launch - voila, we're golden.

Is this a new bug or something? Is there some kind of global setting we should be changing?