Page down button should be disabled in lyrics box

When pressing page down key while inside the lyrics box, one loses the all the control buttons in the top portion of the hookpad screen and no work can be saved. Also, some sort of youtube window appears in the lower right hand corner (which does nothing).

This has occurred many times and one loses work that has been done because one is unable to access any control buttons or tabs that were taken away by hitting page down while in the lyrics box.

If the page down key were disabled while working in the lyrics box this error would never occur.
john B