We have a Magento site that was copied over from an existing Magento site we have, so all products, setting, etc are simply copied to a new domain.
This was done months ago but I am just now trying to use the site. Frontend of site seems to be working great.
Admin panel, in the edit categories page, it keeps "Loading"
I look at the Browser COnsole on this page instantly see this problem....
Mixed Content: The page at 'https://www.domain.com/index.php/admin/catalog_category/index/key/7ac5ce7838cd82114132424faf2b5656/' was loaded over HTTPS, but requested an insecure XMLHttpRequest endpoint 'http://www.domain.com/index.php/admin/catalog_category/edit/key/40eeadefd754406a47f2993be70c4472/?isAjax=true'. This request has been blocked; the content must be served over HTTPS. So it appears this page is making an AJAX call to http://www.domain.com/index.php/admin/catalog_category/edit/key/40eeadefd754406a47f2993be70c4472/?isAjax=true notice the http instead of https
I think fixing this will fix our issues.
In admin config I saw this setting: Use Secure URLs in Admin was set to No so I changed it to yes but no luck on the error going away just yet.
Any ideas how to resolve this please?
UPDATE
It seems my Admin setting for ``Use Secure URLs in Adminis not saving! So changing it;s value toyesis not saving and end up staying asno` so it seems we have more issues. The solution to the admin setting saving could fix the other issue.
Any ideas here?

