So far, iGO NG functioned normally on Android 6, 7, 7.1.1, 8.0 and 8.1 (on my two phones). And the previous systems, but these are current.
Yesterday morning, my Sony updated, "Pie" arrived, Android 9.0, and Israel NG will not start at all.
It does not show any error, reinstall did not helped, delete cache, save the folder ... nor has anything to do with global_cfg ... just a blank screen and that's it. NDS and Sygic are doing the most normal.
I'm just publishing my experience, possible solutions I tried all (except factory reset).

Actually, tested, no iGO NG version is working, except that legally downloaded from the GP.