No it's like this.
Make a change in a scenario goal or something important on a self contained map. Now, if the last map you went to was say mud skippers and we made a big change on the mud skipper files. Say you haven't played any other maps but that one before the change. Other games and such don't count only the map that was last played in RailRoads.
Now you go into the map and click on the map load screen and crash.
If you "scroll" past the map then scroll right back, then reload the map, it fully loads the files.
Try it yourself, it may have been happening to you and others and you didn't even notice.
Happens every time for me. Now you have to change something big, scenario goals etc...changing something inside a nif or kfm won't trigger this.
Try it a couple times and maybe you will see what I am talking about. It may explain some crashes people might have experienced. This happens on my files and all of the beta testers I have asked about this.
It's no biggie, because after you crash out an updated map like that, the next time you go right back and reload it, the game will fully load the map file and no crash on the reload ever after that. I haven't dug very deep into this; I just know it happens when I change major items in the files and then go right back in-game to test something.
It's like the last load of a scenario the game saves some of the major items listed in the files and assets "somewhere". and the map load screen in-game has something to do with what was last loaded from that scenario file.
Sorry if I haden't explained this fully/correctly in the past.
edit//I should also say that the clean install compatible map files I use have built-in global files, maybe it only affects mine? At any rate it happens, I have learned to work around it easy enough.

I'll fire-up mud skippers and give it a run through later this evening and see what's up...thanks again.