Time To Upgrade With Datacolor
So it is with electronic gear. The first glitch is frightening and causes concern but after you discover that you can "cure" it by turning the thing off and on again or banging the side of he box, you tend to just carry on and let it happen.
So it was with my old Datacolor Spyder 2 Express program in the iMac and Macbook Pro. It worked fine for 5 years and then occasionally it would hang up at the last part of the calibrations sequence - the screen would go sort of pinkish and I would have to run it again to get it to go straight through. One day the second run did not cure it and I needed a third one...kick, kick, kick...
Out with the electronic roscoe. Removed the Spyder 2 Express and installed a Spyder 4 Express in its place. All has become better. The new program works efficiently and already recognises what it must do without having to be repeatedly told.
One can only assume that there is a finite life to software, as there is to horses.