Thanks Sea Urchin, hadn't thought of that route. Didn't work though, same dialog box came up with no different buttons or options.
Incidentally, I have my choice of pointers saved as a scheme. When I start the computer and have to reset to my sceme, it is already highlighted as being in use. All I have to do is click OK - I don't have to re-apply.
Just a long shot, but it might work. If you select a different scheme and Save As etc - go through the procedure - then open up again and select your scheme and again Save As etc. Sounds crazy, but it can work.