I'm glad you've got your gallery working but I'll try to clarify a few things.
When you save a gallery with svBuilder-Pro (on the 'Publish' tab), the application saves all the gallery files (the 'svcore', 'images' and 'thumbs' folders and the 'gallery.xml' and 'index.html' files) to the Gallery Folder specified on the 'Publish' tab.
Your first suggestion said to copy the contents of the Simpleviewer folder into the directory where the html page that contains the embedding code, but everything was already in the same directory.
The gallery files were in a subdirectory (named 'SimpleViewer') within your root directory ('public_html').
They would need to have been copied from the 'SimpleViewer' directory directly into the 'public_html' directory where the page containing the gallery's embedding code was.
This is a simple website with everything in one "directory".
The web page containing your gallery's embedding code was in a different directory to your gallery files.
The web page containing your gallery's embedding code was in 'public_html'.
Your gallery files were in 'public_html/SimpleViewer' (a different directory).
It seems incredible to me that the end user has to be doing so much alteration to the basic code.
The example in the baseURL support section here has the changes from the regular embedding code highlighted in bold.
Please see this FAQ:
My gallery does not show in Firefox or gets cropped to a small height. Why?
A quick fix would simply be to change your gallery's height to be a fixed pixel value.
For example, change:
simpleviewer.load('sv-container', '100%', '100%', '333333', true, flashvars);
... to something like:
simpleviewer.load('sv-container', '100%', '600px', '333333', true, flashvars);
This should hopefully solve your problem.
SimpleViewer Support Team