The first is your menu item... "Refresh the Octane scene from Poser"
The second capture is what happens to the textures when I play a render in Render viewport.
The third is what I finally get if I use "Re-import the Whole Scene from Poser" from the Octane 'Material ' Tab
It looks like the Refresh is increasing the bump map value somehow. I will look into it. If you just load the pz3, and then open the Viewport, do you get 2 or 3?
FYI...
Refresh the Octane scene from Poser = Reload the geometry of the scene into the Material tab tree structure and re-check all materials have been converted to Octane materials. If the Viewport is open, it will also reload the geometry (vertices) into the Octane scene.
Re-import the Whole Scene from Poser = Reconvert all materials from the Poser Material room (ie. you loose any Octane materials you had previously setup).
Paul