If you have updated to WordPress 3.7.1 and encountered not working or not showing Visual Editor in your post/page dashboard, then here are some possible fixes to your WordPress problem.
Adding a Code to WP-Config Method
Step 1. Login to your hosting account and go to File Manager and select the domain you are editing.
Step 2. Edit the wp-config.php file by adding the following piece of code:
define('CONCATENATE_SCRIPTS', false );
Step 4. Create a new post/page and you will now see the Visual Editor working or showing.
Other Fixes from WordPress Forums
Use Google Libraries Plugin
Based on information from past forums of people struggling with this, installing the “Use Google Libraries” plugin, and then activating it (don’t forget to activate it, as it won’t activate automatically after installation) fixes the issue.
Editing User Profile
1. Go to Users->”Username” and check the box that says “Disable the visual editor when writing”. Update Profile.
2. Go to Post or Page and verify that the visual editor is disabled.
3. Go back to Users and uncheck the box and save.