I just noticed the same thing. Now I have two plugins not working after 3.9 was installed — WordPress SEO and MaxButtons.
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.
VP
(@studio500)
Same here for me. Yoast is not working at all.
Click othet link and have 403 error
Forbidden
You don’t have permission to access /wp-admin/admin.php?page=wpseo_dashboard on this server.
http://www.domain.com/wp-admin/admin.php?page=wpseo_dashboard
what me do?
Hello buddies. my problem resolved. it was happening because of auto attachments plugin. i activated plugins one by one and find the issue with this one. i wrote on their support forum and they accepted the issue and replied that they are working to resolve.
Hello, I also experienced problems with yoast after updating to wordpress 3.9.
I found the solution here:
https://wordpress.org/support/topic/qtranslate-and-wordpress-39?replies=52
qTranslate plugin caused the trouble. After fixing this, alle my plugins, including Yoast worked fine again!
