Hello,I'm having an issue with my 747X LNAV system...When I input and activate a route into my FMC, it works just fine.However, after passing through the first waypoint, the CDU does not change to the next waypoint.Basically, the first waypoint remains magenta and doesn't turn white...As a result, my plane just circles around instead of following the assigned route.Any help is appreciated!Sincerely,Andrew ChangPMDG 747X User