I am user of Google Sketch up..., but m not so expert. last week i met some problem which the file can't render. I guess because of heavy file. i was recommend  to someway hope it can help in someday you meet similar problem
1. Try to explore object form group and component
2. window > Model Inf > statistic> Purge unused or fix problem
3. Vray option> out put > render out put > save as VRI File
but it need  Exr File.  we need other application http://help.chaosgroup.com/vray/misc/tools/vsketchup.html
it helpful video 
https://www.youtube.com/watch?v=z-aUKPNrm_w