Same here, first time i could play.
Now, everytime when i want to jump into the cockpit, following error message appears:
1) Bad boolean data for attribute e:\WOFF\OBDWW1 Over Flanders Fields\ui.xml.UI.PlayerEffects.isDirty
and then
2) WOFF DLL did not start or WOFF DLL runtime crash!
Mission outcome could there not be evaluated!
C:\Users\...\Roaming\OBD_Games\OBDWW1 Over Flanders Fields\Outcomes.xml.