import of gpx tracks in navigator on android

I imported the new version recently. Looks good. Works not as i want it. When importing Gpx track files i used to get a line on the chart. But now with most of my gpx files nothing happens. Some work, most of them do not. I really need these gpx files to be dusplayed on Navigator. i will drive on locations with bad reception of data, so i need my pre loaded charts of Navigator.

Please help.