Several people seem to have reported this problem. The best solution seems to be to reduce all of the textures to 50% or less in a graphics editing program, particularly the bump maps. If the problem persists, you might try deleting the Geometries .rsr for the dragon....

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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.