I am brand new to Aces High, been messing with it offline for a few days, and haven't set up an online account yet for the arena. Want to preview it enough so that I don't look completely stupid when I do start online.
But here is one thing that I've found that will cause it to crash every time. If I manually delete the last mission files that I had saved and compiled, and then try to open the Mission Editor, it crashes. Guess that might be why deleting the CFG file clears that problem.
Up to this moment in time, I had been restoring the mission files that I had deleted, in order to get back in. Then before I left the Mission Editor again, I was leaving it in the state with a "New Mission" sitting in it, knowing I wouldn't manually delete that file.
So much for me to learn, so little time....