Icarus747,
when you tried your direct-to RBV scenario in the big sim, was there any leg after RBV?
In PSX, the direct-to field at 6R is boxed whenever there is no leg after the direct-to fix. This is the case when there is a route discontinuity or the end of the route after the direct-to fix. This is just a cosmetic feature. The FMC knows the course, it just won't show it.
I can't remember where I got this information from that the boxes appear when there's no leg after the direct-to fix.
Anyway, there must be a condition in the real FMC that causes the boxes to appear. If I remove the above conditions, the boxes will never appear. That can't be correct either.
Regards,
|-|ardy