[TCecil]

Thank you Malte and Mike.

I've since learned that my Samsung tablet was overwhelmed by the complex screen configuration by zone and was seizing up when it was unsure about which zone I was in.  So I went back to single page forward/backward only, which is working fine; I just write instructions to myself to "advance one" or "advance two" depending on where the opportunities in the score present.

And yes, the performance mode is superb for avoiding surprises.

Great product.