Every time I try to start a new game with a custom faction the game crashes to the desktop. I'm opted in to the latest 3.5 beta patch.
I have tried creating a completely new faction as well as making a copy of an existing faction. I have also tried creating during new game setup as well as in the faction creator.
I am able to start new games just fine with any of the default factions.
One thing I notice is that it always has the same lines in the error log:
Debug Message: Building tech tree for node: GenericEngineeringTech
Debug Message: WARNING: Failed to find tech specialization def: -1189087473
Is the editor not correctly setting up the tech trees? Anyone know of a workaround?