Hello... I am curious if you are using the TinyMCE library for your content editor. We had some hooks in the content using the <span> tag, but anytime we change with the Visual editor tab, the <span> tags get stripped out of the html. Our developer is using Version 2.1.17, so maybe this is changed in a later version? If so, we can ask them to update.
Just realized that by reading some other questions in your forum that we are using the latest free version. I also discoverd via the developer tools in chrome that it does look like Accordion uses tinyMCE for editing content. Do you know of a way to tell tinyMCE to not strip out the <span> tag?