I imported a terrain mesh as a .3ds that I built in Sketchup.

I applied ecosytems to different layers that I had in the mesh.  (I had put certain faces of the mesh on different layers in Sketchup)

Then after I populated the ecosystems, and rotated the camera to get a closer look, all the ecosystems veg. MOVED BY A 1/4 OF A MILE OR SO... so I had to RE-populated each of the 5-6 ecosystems... this happened 5 or 6 times, then I closed VUE and did it in VIZ and Photoshop.

There are some things about V5i I REALLY hate... working with imported objects is it's major weakness.