Hi Claus,
I have downloaded and run 'Simon Test' in Excel, it ran to some extent, but as you say, there is something wrong as it doesn't go through the entire program, and indeed it did pinpoint the line you suggested as having the error, with the yellow arrow, but I am not sure how to fix this, as when the spaces are gotten rid of, it still changes back to the original coding (see previous message).I think it is the author's fault (Duane Birnbaum, Michael Vine) for publishing shoddy code.
Thank you for your selfless help.
Yours Simon.