Got it working. It was the Visual Editor that needed to be reset. Apparently lots of people who've upgraded to 3.9 are having a similar issue. Do the following if you are one of them:
1. Deactivate ALL plugins.
2. Switch to default TwentyFourteen theme.
3. Manually empty browser cache.
After I saw the WordPress SEO problem I noticed that the visual editor for Widgets wasn't working either. That's when I knew it was an issue with my browser.
NOTE: Just clearing your cache won't fix this. You must deactivate your plugins and use 2014 before you can start adding your changes back.
For a great write-up on this check out: http://wptavern.com/common-issues-and-troubleshooting-wordpress-3-9.
Thanks Jeff Chandler @wptavern for taking the time to provide these details.