Hi,
I am not sure why this topic was closed so I have started a fresh one.
I restored another copy of the server and disabled the Salient Theme as suggested and user two other basic WordPress themes, this did indeed seem to solve the problem.
As far as I am aware no custom CSS code has been added to this site so I wanted to check that when you said this was due to poor CSS coding were you referring to the Theme itself? If so I am guessing there is very little we will be able to do in that respect.
Thanks
David