Hi there,
The Really Simple SSL plugin, is only needed when you haven’t migrated your site properly to https. Migrating to SSL needs a certificate + manually doing some work, to prevent mixed content issues. Installing the Really Simple SSL may or may not work (in appearance), but your database references are still pointing to http and not https.
There is no problem on FVM, except that it may be reading http instead of https, directly from the database, but there is an option on the plugin settings to force https.
I suggest using a search and replace plugin to replace all https:// entries on your database with https:// as that is the correct way to migrate the site to https.
Since you offer no further explanation of “problems”, I assume that’s the real issue there.
