And a very perplexing issue, at least with the B-787. Make sure there are no "VECTORS" or "THEN" entries in your Flight Plan. If so, tap the DELETE key on the keypad next to the display, then tap the button adjacent to VECTOR or THEN. Also, by changing from MAP to PLAN on your NAV display, it allows you to check out the STEPS along your route from departure to arrival to see for any discontinuities.