Hello,
There seems to be a small bug which might be related to full-screen mode (it might be related to being in Full screen mode then quitting).
I am unclear as to the exact steps to fix it but some of these might help:
- Window>Exit full screen mode
- click some songs
- quit then re-launch the app
Do these in any order, from time to time check to see if the Print window or Email Song (or Playlist) works. Once I have the problem, I can seem to clear it in about 20 seconds just trying these things.
Let me know if this works. Thanks.

We are working on an update so will look into this.