It only happens on the new The Dead World Map from the DLC.
And after every crash, I need to go to Steam, perform a validation check and it would download the DLC (3.1mb) all over again.
Only then, can I restart LH and try to reload.
I've also tried to delete all content and just reinstalling the game from stratch... to no avail.
Currently playing the newly re-added FE scenario, which is fun.