First time in - loaded map files and entered arena - all is well. Went to DA - then back to MA - White screen with the old "aces high has encountered an problem..."
2nd crash was when spawning in a mission, White Screen with same message, only no mouse cursor. had to reset...ugly one at that - took restarting 2 times and a full shutdown/restart just to get web browser to work to write this.
Had no clue a terrain was tied that closely to the operation of the game.