Ciaran,
I recently tried to add SSL to my Substance site. I modified the configuration.php file and the .htaccess file and then enabled SSL for the entire site in the Joomla Server Settings section. However, although the content is there, the https site (a) does not display the Slideshow module and (b) the fonts in the menu are not displaying. There may be more issues, but so as not to have downtime while I was trying to figure out the problems, I reversed the modifications I made and did not examine the site fully.
I suspect that there are some references in some files to “http://” instead of “http://”. However, I searched the folders and files that I thought could be at fault and did not come up with anything.
Before I invest a lot more time and frustration trying to figure this out, have you come up with this before or have any suggestions where I should look? Thanks!