Animated Maps: Disappearing Waypoints

Running FM 6 (version 6.3) and facing the following issue: Waypoints defined along an animated longer route will displayed correctly when running the presentation until approx the middle of the way, then suddenly disappear and the remaining waypoints until the end of the route will not show up anyway.

Does this always happen with long routes, or just when crossing the international dateline?

It seems not to be an issue of long routes, since part one (Hamburg - San Francisco) is working fine and on part two (San Francisco - Genua) the problem occurs crossing Colombo. I‘ll try to define route part two from scratch and see if it occurs again. Could it be an issue as route part 2 is immediately following route part one in the storyline or is there any limitations in the max numbers of waypoints?