Thought you might want to know that I too have experienced the the same VNAV issues as @Nados. Most of the time when I enter a flight plan into the FMC the altitude restrictions are incorporated into the legs page. But sometimes the altitude restrictions are missing. It's not mentioned in any of the previous posts, but I get my Nav updates from a Navigraph subscription. I point the Navigraph FMS updater to the X-Plane 12\Aircraft\ X-Aviation\IXEG 727 Classic Plus as suggested here.
However, I see no information when I look into the IXEG "fmc_data" folder.
I'll use a flight from KMCI to KMDW for an example. ROYAL1 ARENZ IRK ENDEE6
ENDEE6 has many flight and speed restrictions.
Anybody else having this issue or can you see if I am doing something wrong? I have tried this in the Zibo 737-800 (which I have a screenshot of) and have no issues, The restrictions problems there, and yes I completed the performance page BEFORE the flight route page and filled in all the information.
Buy the way, its worth mentioning, this aircraft flies great. I hand fly this model a lot on departures and arrivals below 10,000 feet and when I'm not using online ATC.
Thank you.