Beaver Builder Pro /Themer stopped working on multisite

All has been fine for my multisite (2 sites) until recently. Now I cannot edit with beaver builder at all on one of the sites while the other is working fine. I have tried deactivating, re-installing, etc. etc. but still no joy. Any help is welcome. Could there be connection to the fact that we recently moved from HTTP to HTTPS? The site which stopped working is: