Not sure on group and components, I think a exploded the model but that was because I was looking at smoothing issues. I'm sorry but not near my machine for a couple of days to give further feedback, but can't wait to get back to it, having just purchased Octane.
Biggest thing I learnt was that smoothing is applied by colour, so say you have a flat face and curved face both in same colour, when you apply smoothing in octane, the flat face or any faces in that colour get smoothed. That's when you get the dark shading across the flat faces. So now I'm careful to create diferent material names for flat and curved faces. I didn't have time to check out how this is effected when you apply materials to groups or components.
GTX 550Ti 1GB - XP PRO 32 bit - Sketchup Pro user.