If you follow the links in the thread mentioned above, you'll end up here -> http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2717864
You must delete the PMD file associated with the problem PZ3 file.

Unchecking the "Use external binary morph targets" option only affects the creation of PMD files, it does not affect (attempting) reading of them when referenced by another file.