Hi Itoo!
I've got my new workstation and two rtx cards to "play" with forest and Vray, but for now, in GPU mode and not Cuda but RTX mode it seems that forest pack pro never rendered...
I've look around to place proxy in "geometry mode" And limit the forest pack pro object to a small rectangle, and nothing's rendering...
Maps are correctly rooted, the scene isn't heavy...
It seems ffp don't render...