If it's Poser 5 procedural materials, many of them WILL load as white. But my guess it that you've hit the Smooth Shaded display option instead of Texture Shaded.

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.