I use to be able to fly my add-on planes in very close formation but now - perhaps since I reinstalled CFS2 - I cannot get the planes to say in their assigned positions. 

They keep alternating between shallow diving and climbing.

Is it possible that I need to reinstall the add-ons from scratch rather then just reinstall CFS2 and leave the planes were they were in the previous installation?

Or can I go someplce in the program to turn off this climbing and diving routine?

Don