ORF files and CS6
Thank you all for your assistance. CS6 was functioning well prior to the current update but problems occurred following the upgrade. I could not get a preview, changes I made in PS could not be saved and when I saved a PS file as a JPG the result was blown out by at least two stops.
However, for some reason the problem resolved itself and CS6 id now functioning well with ORF files. As far as I am aware I did nothing to bring this about. I was working on CR2 files and when I switched to ORF all was well.
The only thing I cannot seem to do now is open a PS file in camera raw but I will continue working on this.