Looks like the route didn't open entirely due to some glitch when I tried opening it the second time, so when it auto saved it only saved what did
open, and lost the majority of the route. I'm afraid to open any of them now; if they don't completely load, then the autosave kicks in, seems like I could lose another route.
I had many hours into that one.
edit: I guess the fix is to make sure to make many copy's of each route so that hopefully you can go back to a remaining one if a glitch wipes out the route you are working on...