FV First scene playblast

I've changed the camera slightly to give a better view of the body swimming but I still can't explain how the worm dips to the side and down?

Fantastic Voyage Hookworm skinning and rigging

Today I have worked on rigging and skinning my hookworm and while the skinning is not perfect, it's a start! It moves! I also have problems with rendering, weird errors keep appearing: // Error: *Fatal* (mental ray) : mental ray encountered a fatal error. The system may have become unstable. Please save the scene and exit Maya.
Does anyone know a permanent fix to this, I have imported my hookworm twice so far?