If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
How can I reduce big image size for single portfolio page? The preset image size is 930×523 but I would like to change it to 930×370. I changed it in function.php and turned off and on web server, but the big image size is not changed.
I think you need to regenerate the thumbnails with: http://wordpress.org/extend/plugins/regenerate-thumbnails/ :)
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