Hi Michal,
Thanks for doing that. It worked.
I did some tests with the passwords, and discovered that the problem was a special character in the password! As soon as I took out the special character it works fine.
Unfortunately, there are other issues with that version that mean we are sticking with 2.7.5. We have our libraries on a server, and re-target all texture paths to the server to make sure that all the render nodes are using exactly the same assets. I understand from reading through the forums that this is not possible with the update manager, so we will be waiting for a later version where this feature has been added.
Thanks for your help though. As always you've solved the problem.
Cheers,
Bill