All the styles you have "tried" so far have been probably accumulating in your file (also this is why it may be "bloated"). Especially sketchy styles tend to be big in file size as they can contain considerable size raster images. Try to purge your file under Widow > Model info > Statistics.

@sinanp said: Not quite sure what happened but the install must have been corrupted/faulty reinstalled VRAY and finally getting some model outputs! thanks very much Or ... it could be the disappearing group bug. Which will correct itself if you reload the file...

Thanks loads, all the help I needed, much appreciated