On my first days with the Pro1X I suddenly had a massive problem with GPX, too. (I suspect that was before GPS had properly initialised itself; perhaps no Assisted GPS data was loaded yet, but that's me stabbing around in the dark.) I'm using an app named Locus for hiking. When I switched it to satellites view, there were some two dozens of satellites in view but all showed up red even though I was outside and a lot should have been in sight. It took some time, but in the end the phone started to find the satellites. Until then, it had been using mobile/WiFi data to approximate the location wh