Domain mapping wp-ajax.php mixed content

After the new update for Domain Mapping (4.4.3 and 4.4.3.1), every one of my subsites is giving me a mixed content error on the backend, and I've forced ssl, fixed all the mixed content warnings, etc but still getting blocked by admin-ajax.

Downgrading the plugin to the previous version (version 4.4.2.5) fixed the issues.