Have you upgraded to SR3? Poser 8 in its early versions had problems with obj exporter on European systems, the ever-present comma issue I think.

It was solved in later SR's I thing even SR1, but not sure. I can export objs just fine from mine, Danish Windows,  P8 SR3

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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.