New using DLVP, seems to be a great tool but I'm facing the same problem Sebastian posted about the 3D orientation of my fixtures.
I go through this steps:
1. Draw my design on top/plan view with lights (position field filled) and trusses (converted to hanging position)
2. I run "Create Plot and Model View"
3. I get my DLVP, I rotate it to obtain the desire result: in this particularly case its a +90º rotation to see my "ex" top/plan design vertically in a new front view.
4. When I get the viewports I do the +90º rotation, trusses are okay but fixtures get a random 3D orientation.
PS: I try including Z Rotation on them also, but it doesn't solve the problem
Here some images: