On my first LGC 15, the screen would not work reliably. But, if you pressed below the pad on the screen, you could get the entry to register. However, that would not work for the exit back to the main screen because the press point was off the screen. I had to shut the unit off to exit back to the main screen. I ended up sending it back to Dirk. He sent me a new one, which worked great. Then, I saw another one out in the field that when left in the sun, it would go to a screen recalibration routine. Once the recalibration was completed, it would work again. Point being, maybe there is a screen recalibration routine??? Maybe a question to Gaspar is in order here.