Hi David,
Maybe so but I have always used my FDC standard loaded onto my external F hard drive. I would fly from any plane and no problems. The problem was when I added quality wings BAE 146 to FDC and learned how to add extra things like Pre start before taxi and all those exciting things. This is where all went wrong, as mentioned Pre starts taxies and take off all go well but when in the air loose FDC. I am going to fly a BAE 146 THAT IS NOT ADDED ON, and see if all works well as well as the DHC OTTO. I will let you know how that went.
Alfred.