Not working with HTTPS

At first I thought it might have been a plugin conflict. But no. If I am logged in to my site and using https then the plugin doesn’t work.

The metabox still shows up but instead of showing the search box, button and Copy Title link it shows:

– Search box and button
– Flickr and Pixabay checkboxes
– Copy Title link
– All Selected: Insert Normal Align Left Align Right Align Center Remove
– Enjoying WP Inject? Please share! Settings
– SQ S M L radio buttons

Trying to search for anything doesn’t do anything.

Now if I log into the same site without going through https then it works as advertised.

https://ww.wp.xz.cn/plugins/wp-inject/