Problem with HTTPS

I had two installations, one worked the other didn’t. I almost died to find why. So, the suspect is HTTPS. With it on I couldn’t see your pop-ups working at all, they wouldn’t appear. If you install ‘SSL Insecure Content Fixer’ or ‘WordPress HTTPS’ plugins, they let it work with their default settings. The reason might be in specifying FORCE_SSL_ADMIN in wp-config.php, but I have not tested further, just keeping the current plugin.

All settings are default, the behaviour is reproduced with no other plugins on TwentyTwelve (ver. just before 1.9, don’t know the number).

https://www.ads-software.com/plugins/user-roles-and-capabilities/