Just an observation/thought:

I had these issues in the beginning with all three 757, 767 and 777.
However, in the meantime I´ve had quite a few flights with all of them, and the issues with missing End of route and T/D seem to have vanished. Maybe I have just been lucky to use some airports that the FMC could “catch”. But I have used new Dep and ARR airports on each flight – programming went just effortless after a the very first 2-3 flights where I needed such fixes.

The way I´m programming the route is, using the freeware Flight planner; RFinder.asalink.net/free
1)      In the DEP/ARR section; type in Departure airport with RWY and SID
2)      From SID, I program the entire route. Last waypoint is the STAR of the Arrival airport.
3)      Navigating to the arrival airport in FSX map section, I find a proper RWY, and enter this in the FMC along with the proper STAR according to the flight plan.

I may end up with some silly arrivals, but this can be corrected in the LEGS section.

Using this procedure, I´ve not had any such issues in the latest 15-20 flights.

BR,
Anders