Hello Regina and Jorge,
Thank you for your help and suggestions. I apologize for the delay as I didn't get the emails until I received the daily digest this afternoon. I have quoted both your posts in order to keep them together but this post is getting rather long.
I have tried your suggestions and I'm still unable to get a basic decimal calculation to work.
But now I am getting "#NAME?" for the cell containing "=1+1.5".
Interestingly enough, if I put "=1+20" it does give me "21" as an answer.
What it doesn't like about the decimal place I don't understand. This is very strange.
I tried using a comma "," instead as a decimal separator but that didn't work either.
Perhaps I should delete all the preferences and all the extensions in the Application Support folder?? Then I would have a "new" install?
Thanks again and regards,
B.