Poser Pro (2014) imports SL .bvh with a backward tilt

[Prodigal Maeterlinck]

I'd made plenty of animations in Poser 8 in the past, starting again with Proser Pro, and though it's been a long time the import process is familiar to me. I'm trying to port the standard bvh's into Poser Pro, but every avatar anim (except for the T-pose) its tilted ~3 degrees backward. When I port the same bvh back into SL, it's similarly tilted.

It can't be a problem with the model import, because the Universal Poses included with Poser work fine, both on the Poser stage and ported to SL. So I can produce new animations without the avatar poses, but having reference animations to work with would be a great help to relearning the craft.