I am also having the same issue that Hornet54 was having. None of the graphics settings are improving things. I've tried reinstalling the whole mod as well, but that didn't work. Whenever trying to start a campaign, regardless of which campaign, aircraft, or service I choose, it loads into the campaign but is unable to load a mission, freezing for a minute and then crashing to desktop at 80%. When I attempt to start Scramble, it instead freezes at 50% and does not crash or move, and I need to end the task in order to exit. This also occurs when attempting to create a single mission.
I'm not sure if this is normal or if it helps pinpoint the issue, but in the main campaign screen, where you see your mission briefing, there is no picture of an airplane in the hangar like in vanilla SF2, just an empty hangar.
Is there any way to enable error logging or something to see what exactly is causing the crashes/freezes?