are you using Luxrender 0.7 or Luxrender 0.8? The script works with Luxrender 0.8x because it uses material parameters that weren't supported in Luxrender 0.7x like velvet, glossy translucent, SSS, etc.

You can get the most current release of Luxrender here. What you want is LuxRender (v0.8RC1).

pssst...this info is in the Pose2Lux manual ;).

If this is not your problem, then it's a problem with the script, but I think it may be Luxrender due to the fact that it's exporting without error but Luxrender is having a hard time reading it. You really need to keep current with Luxrender versions because the programmer of Pose2Lux is ;).

Laurie