Hi olio,

It has nothing to do with the geometry (I guess), but it more depends of the surface/lighting settings. I had this kind of trouble with MoI geomtry (once), but also
with models build inside modo.

This pink dots are 'rendering error', some kind of division by zero stuff, I don't know more.

Try to change some lighting settings (reducing lighting power), disable any hdri env map, remove reflection/splecular on the surface that seems giving pixel of the death, until you find what appends ... and maybe create a bug report with a scene sample, so they can fix it.

SP2 is supposed to come at the end of the month, I hope it will be completely fixed :S

This may seem 'non-traditional' but I would suggest Hexagon and Carrara Pro as excellent companion applications for MoI.

Hexagon is a decent enough polygon modeler, same for Carrara for the texturing, lighting, animation, and rendering. The cost of ownership of these apps is low, much lower than anything else except Blender, and the learning curve is somewhat gentle.