Dave -

Toggling that setting has actually worked. The user most affected by this
issue has been shown how to do this, and now has a copy of the Names Manager;
as some of the sheets he gets contain over three thousand names - most of
which refer to remote files behind the senders' firewalls - he is happy and
will probably make contented burbling noises for the remainder of the
afternoon.

Thanks for the help -

N