Getting back to the original topic of this thread, my impression was that the Blinn, Anisotropic, etc shaders were not working at all, but that the cycles shaders were working. But I am seeing big differences in the cycles GlossyBSDF too -- it works, but the results are dramatically different. At least in my render, in P12 I'm getting an extremely glossy result (wet look) whereas in P11 with the same settings it was just some soft highlighting. (I think these shaders are from D3D...? Not 100% certain.)

On the other hand, I really want it to work because the same render took 6 hours in P11 (a little puzzled by that actually, something has started going wrong there) and 10-15 minutes in P12. (Images below are cropped, not the whole render.)

But if you're rebuilding your shaders with GlossyBSDF and that shader is not currently functioning correctly.....

Poser 11:

Poser 12:

Note that while the skin got really glossy in P12, the eye surface (which also has GlossyBSDF) became less so.

Here's a snippet of the skin shader:

There's also something weird going on with the fabric behind the character, maybe a difference in displacement? Have not played with it since the result is equally ok, but it is distinctly not the same if you overlay them. (If you do, note the figure moving up and down is not a P12 artifact, I bumped her up a hair to fix the positioning.)