HTTPS Mixed Content – Errors

Hi Martin! I recently changed my website from HTTP to HTTPS, everything works fine excepted for your plugin. I get the following errors:

Mixed Content – Errors
An image with an insecure url of “https://www.mydomain.com/wp-content/plugins/rotatingtweets/images/twitter-bird-16×16.png” was loaded on line: 129 of https://www.mydomain.com/.
This URL will need to be updated to use a secure URL for your padlock to return.
Soft Failure
An image with an insecure url of “https://www.mydomain.com/wp-content/plugins/rotatingtweets/images/reply.png” was loaded on line: 136 of https://www.mydomain.com/.
This URL will need to be updated to use a secure URL for your padlock to return.
Soft Failure
An image with an insecure url of “https://www.mydomain.com/wp-content/plugins/rotatingtweets/images/retweet.png” was loaded on line: 137 of https://www.mydomain.com/.
This URL will need to be updated to use a secure URL for your padlock to return.
Soft Failure
An image with an insecure url of “https://www.mydomain.com/wp-content/plugins/rotatingtweets/images/favorite.png” was loaded on line: 138 of https://www.mydomain.com/.
This URL will need to be updated to use a secure URL for your padlock to return.

Do you know why it’s only happening with your plugin? And why your plugin still calls for non-secure images even though the whole site in perfectly working on HTTPS?

I also tried to force SSL through the wp-config file using:

define('WP_HOME', 'https://www.mydomain.com');
define('WP_SITEURL', 'https://www.mydomain.com');

It’s not working either. I tried on multiple websites with the same result…

Thanks for your help!