I think that BB has said that Poser's implimentation of transparency is, well, funky. I know the word 'funky' is not a word he would use, but you catch my drift? Maybe BB will come by and explain it in more technical terms. You can in Bryce use transparency with a water plane and it works fine, but in Poser transparency doesn't 'play well' with reflect and refract nodes.

"A lonely climber walks a tightrope to where dreams are born and never die!" - Billy Thorpe, song: Edge of Madness, album: East of Eden's Gate

Weapons of choice:

Poser Pro 2012, SR2, Paintshop Pro 8