[fausto]

This could be a problem with your tablet rather than Mobilesheets. I've found by trial and error that staying too long on a long press does not work on my tablet. I have to lift off after just less than a second or else all that happens is my screen goes dimmer!
It's difficult to describe but I need a totally different type of touch on my tablet than the touch I had developed on my iPhone. I sympathise with your troubles; very frustrating.