Due to changing versions of libopenmv the current release of METAbolt does not support the physics layer. What this means is that your Pandorabot METAbolt bot should not wear any physics layer. There is a known issue with interaction of the physics layer and viewers not supporting the physics layer where the avatar may occasionally be "Ruthed" (take on the appearance of the Ruth starter avatar). To be safe, for now, do not wear a physics layer on avatars using METAbolt 0.9.46.0.
I have communicated with Legolas Luke, the primary METAbolt developer, and he indicates that physics layer support is coming. Stay tuned.