After getting anxious, and not finding any other helpful information on the forums or web, I decided to just bite the bullet and do a complete reinstall after downloading WordPress again (after all, there was really no content on my page yet).
For whatever reason, it worked. And I now have the “Add Media” box when I click the button.
Not sure what caused this. Both times all the files were uploaded successfully to my FTP.
Oh well… it’s working now.
I’m using Chrome. But I also tried it in Firefox, and got the same result.
Per your advice, I tried clearing my browsers cache, restarting it, and deleting the two default plug-ins (neither we active, but just to be sure), and still, nothing happens when I click “Add Media.”
The only thing I did notice is that, when I click “Add Media.” my URL changes from
http://dugwebb.com/home/wp-admin/post-new.php
to:
http://dugwebb.com/home/wp-admin/post-new.php#
Is that pound sign/hashtag trying to tell me something?