[jdavia]

If you had only a few lines like two or three to show and the window was small, your mouse may not be at the same position as the singers window to retrieve it. Your mouse must be on it to move it.
The singers window can be at the bottom corner or the top corner of the screen, even the center. Try all locations to find it. If it is active, it is there somewhere.
I experimented with it to find this out.