I have been advised in another thread that this is error 500.
I have followed all advice, deactivated plugins etc, and still the problem persists.
I have talked to Godaddy at length to try to obtain correct FTP details so that you can assist me. I cannot add you as an extra FTP user, as this is a managed Wordpress account, and so you have to go in using my details.
I shall attach them in a secure note. They have worked for me using Filezilla, so I hope they will work for you
With Thanks
Elen
ps all of these problems seem to have followed changing my main domain name, and problems with activating the license that followe this (now fixed), and now the saving problem. Just mentioning in case this helps!