I have plans that I am working on in ACA 2008 and switch between that and ACA2009. The way I have it set up is that one viewport is in plan view and the other is in 3D view. For some reason when I open the files in ACA 2009 every time I switch between the plan viewport and the 3D viewport, the 3D viewport always goes back to the plan view. I don't know how to get it to not change the view.