[Zubersoft]

Richard,

I'm definitely at a loss right now to understand what's going on. There is one last thing I'd like you to try - go to Settings->Other Settings->Reset Settings to Default. Then load your song and see if tapping on the center works. 

As a side note, the lock icon in the floating toolbar at the bottom right corner of the library screen should be black. If it's orange, you need to tap it to turn off performance mode (I had said "white" before which was incorrect).

Thanks,
Mike