I have site domains all with different names. So, Did exactly how you said, but still getting errors.
I've made sure all my sites have wordfence and are only searching within their own wordpress installation, and disabled config caching, but still didn't work.
So I unselected disable config caching, because I'm not having any trouble with my settings saving, but I couldn't get it to work.
After doing some tests on the other subdomains, I did have some success though, which leads me to believe maybe something else is going on we haven't thought of.
There were 2 warning messages on one of the sites I manage kylekushman.com. One of the warning messages did allow me to view the modified pages, the other one didn't. The one labeled,
Modified plugin file: wp-content/plugins/wysija-newsletters/views/front.php was the one that didn't work. But, Modified plugin file: wp-content/plugins/nextgen-facebook/readme.txt did allow me to view the file.
It also worked purelifeveganix.com for Modified plugin file: wp-content/plugins/store-locator/js/store-locator.js
BUT did not work for Modified plugin file: wp-content/plugins/new-user-approve/new-user-approve.php
So it seems to be that maybe there is some error within that part of the plugin that's working for some files but not all. What could be the cause of this?
Other shared domain susieambrose.com didn't allow me to view modified file which was for: Modified plugin file: wp-content/plugins/wysija-newsletters/js/tinymce_init.js