I hit this same problem…
I updated the plugin WPSSO plugin v3.29.4-1 this morning and have found that it broke a portion of the media upload module. Going to Add Post > Add Media > Select Image > Edit Image. The image fails to load withiin the tool that allows you to crop etc.?
?
From the console, the error looks like this:
<siteurl>/wp-admin/admin-ajax.php?action=imgedit-preview&_ajax_nonce=98d79c427e&postid=5778&rand=15218?
?
From the server error log:
[Fri Apr 15 15:01:49 2016] [error] PHP Fatal error:?Call to a member function get_options() on null in /var/www/html/wp-content/plugins/wpsso/lib/util.php on line 174, referer: <siteurl>/wp-admin/post-new.php
?
I disabled the plugin and the media uploader works again.
I am going to rollback the plugin, although I dont see an easy way to do that either from the documentation on the wordpress site. All i see under other versions is the development version. Frustrating.?
Regards
