As far as I can see now:

- complete routes saved with RWYs, SID and STAR are reloadable

- reloading routes consisting just of the main route elements (departure airport, waypoints, airways and destination airport) crash my FSX (fatal error)

Well as not being a pilot in real life so my oppinion may be wrong but I see the saving of complete routes as not senseful. In contartidiction to this presaved basic routes can be simply loaded and adjusted to the ambient conditions like weather, time, payload situation etc.. This approach is also mirrored by the online route finders like VATroute which also display just the main route elements. Further this system works fine with other simulation providers with higher system depths like PxMxDxG so I would consider this as a bug which is worth to be fixed.