Most likely the Poser 5 figures are installed as compressed files, CRZ's instead of CR2. While Poser 5 and 6 can read those just fine, DS can't.

Easily remedied though. In the Python folder there's a pythonscript to decompress all files.

Or you could open gramps and resave him while making sure the Use Compression in Options is NOT checked.

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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.