Am using ND0 and am finding the swipe up and down gesture intermittently unresponsive.
It happens e.g. on the main stack display - whether it is normal size or maximised. When scrolling up or down, occasionally a swipe will not get recognised.
Whilst intermittent, it's still quite common and easy to reproduce. It makes the calculator experience feel unreliable.
I've also seen it happen in some other parts of ND0 e.g. Go to the Demos / Period to have the periodic table generated, and try swipe around to look at it. Every second or third swipe is ignored, leading to a frustrating experience.
I'm on a iPhone 4S and also have the exact same issue on the iPad (3rd gen).