Hey Guys, I am using networks solutions. I was having the same issue. Very frustrating since I am a developer and could not figure out what was going on. If you can access this file on your blog this post will not help you. yoursite/wp-includes/js/tinymce/plugins/media/editor_plugin.js
If you can not access it then it is a file permission issue. Follow these instructions and it should work.
https://www.networksolutions.com/support/resetting-file-permissions/
I realize this is a very spefic issue and setup but thought I would put it on here just in case.
Good luck to those who still have the issue…
