Sorry I wasn't specific enough. I was not using the editor in this case. I was using:
Offline Practice, Staged Missions, Select MIssions, Missions on newbrit
I usually pick 190s Small against enemy Mosquitos Large. I fly a long time down to the area where merges seem to happen. Now (not in the beginning) when I first see the enemy flight or shortly thereafter, my pc locks up and I am done. I have to pull up the task manager. At that point the message I get is: "aceshigh.exe has stopped working" I can close that message and usually aceshigh will close and I am back to the windows screen with just the Task Manager window open.
Thanks!
Tex