Jay
Thanks for the response.
Following on from your suggestion, I have now worked out what is happening.
I choose to save my documents in word6 format, and it seems that this is
disabling the button.
This fact does become indirectly apparent if you 'hover' the mouse over the
button when some information that gives a clue about this is revealed.
However, originally I tried to 'click' the buton rather than 'hover' - so
didn't get this information.
Hope this helps others
Martin
[PS: When I received an email notifying me of your response, I clicked the
link to take me to it, my browser opned but nothing happened. No page loaded.
I had to find my way back to this page the hard way. Is this because I use
Mozilla rather than IE?]