So I have now watched the tutorial and going back to my CS6 version on my project, sent a short sequence to Speedgrade with the File-Send to SpeedGrade with DirectLink command.
Have opened the resulting IRCP file and the timeline has the two video tracks from the sequence.
I can play it (except for three shots that did not load- more on that later- but the only tabs on the lower third that are live are 'Timeline' and 'Audio'.
Any clues? Thanks!