There is a Nabble forum embedded on that Weebly page that has worked well for many years with security enabled on both the forum and the website. But as of last night the forum wouldn't load with SSL enabled on the Weebly site but would with SSL disabled, which I learned to do a few months ago when this same thing happened.
And whatever you've done has re-enabled SSL on the forum. I've now turned SSL on for the website and the forum works correctly.
So what did you do? Just trying to understand what to ask you to do next time as this happened exactly this way a few months ago.