OK, went out to the car and eveything worked fine - windows solution works again (i.e. reboot). First I thought "how embarassing" and then I thought I'd try playing with all the things I'd played with while I had it sitting on my desk. I managed to get it to not recognise "Cancel" again, but am not sure yet what is going it. I am guessing at Brickout or the calculator, but will have to have a bit more of a play to see. First comes some tea though ... Catch you later.