Hi Mary, Miriam
Issue is resolved, however I do not know how it has been resolved. I went to my site and enabled direct requests to images by URL as a parameter in my hotlink protection settings. This enabled the image to show, however it defeated the purpose of my having hotlink protection on my website, which was to disable other websites ability to link directly to the images on my site and thereby using my bandwidth for their own purposes.
Now, having understood something more of the problem with the access denied that you were talking about, I disabled the direct request to images again, thinking to modify the css somehow to circumvent the problem and keep my hotlink protection intact.
However, after resetting the hotlink protection, clearing the caches in my browser as well as the theme cache, the problem now seems to have resolved itself, and my background image now shows as it ought to do without any modifications required.
So I have my background image and my hotlink protection and all appears to be well. Don't know how, or why, but its fixed itself somehow.
Thanks for your input.
Debbie