Thanks for your trouble, Virginia, you are right, the problem does stem from the registration number.
Whoops! Guess who has been using a registration number from an old version (issue 3 or 4) which has somehow become uploaded when I transferred the data from earlier projects onto the version 5. Guess also who cannot find the registration number for this version, nor can I remember the date I bought it, beyond early 2004?
Can anyone offer a hint on where I go to for help, now?