SSL led to Index page not loading up

My website has been up and running for 10yrs+ Last night I decided to add SSL directly through my server (pair.com) which has been excellent over the years. Now I can access my other pages (there are lots of them) but not open Index - the other pages open but don't show the menu bar. I'm thinking there must be some change I need to make to the code in the index file that is now not recognizing it as it did before. Anyone ever have a similar issue or have ideas about a fix?