Incidentally, here is what I get when refracting a bump mapped surface in Poser 6 with SR1 applied. The scaling trick, unfortunately, doesn't help. Despite of what I wrote before, changing from bump to displacement maps doesn't seem to work either. There's a new 'ray bias' option in the refraction node as of SR1, which I've played around with, as with the refraction quality, all to no effect.

-- I'm not mad at you, just Westphalian.