Hello, I just notice that my Wordpress Media Library will not load. I just sits there and tries loading. Am running WordPress 4.7 running Pinnacle Premium theme.
I've fount for you two solutions:
-A- Go to functions.php file and remove this
add_filter( 'image_size_names_choose', 'custom_image_sizes_choose' );
-B- Make WordPress reinstall itself:
The solutions have been copied from here: