Navigraph 7 on android

is navigraph 7 still able to run all features on anroid tablet-
I am still using 7 on my tablet (ver 8 on pc)
my charts 7 all of a suddent goes to white screen on startup , no longer showing the overal map. When I load a flight, all sids stars taxi etc will display, but when I am enroute between airports out of range of individual charts, and hit the X to go to main map, the moving map goes to a white screen, no map. this just started occuring on Nov 25th ???,
Ideas? thanks

further to above, when within the terminal areas, the magenta airplane still does track–

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tablet is a 10 inch android