The centerOfMass and goalCenterOfMass are special props which later versions of Poser will add to every figure.  AFAIK, they have something to do with posing, perhaps with Universal Poses.  :unsure:  But these special control props have no geometry and thus shouldn't be able to collide with a cloth object or interfere with any clothroom dynamics.  If the clothroom keeps checking collisions for those items, you should be able to ignore them.  Unless something really weird is happening.  :lol:  One can't necessarily rule that out, with Poser.

Where are these "invisible hooks" located, when they snag the cloth?  What does this error look like? 

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.