WordPress SEO was updated to version 2.0.1, from version 1.7.4. Changelogs:

2.0.1

• Fixes an issue where (in rare cases) people upgrading to 2.0 got stuck in a redirect loop on their admin.
• Fixes a broken link in the Dutch translation, causing the Pinterest tab on the Social settings page to overflow into the Google+ tab.
• Fixes a small typo on the about page.

2.0

• Simplified and revised Admin menu’s:Moved all advanced functionality to one “Advanced” submenu page.
• Moved the bulk editor, the export functionality and the file editor to one “Tools” submenu page.
• Improved consistency and usability of settings pages by having them use exactly the same, tab-based, styling.
• Made it easy to output structured data for social profiles, person and company profiles, for use in Google Knowledge Graph.
• Makes sure the user is redirected to the last active settings tab after saving.
• Fixes a bug where custom field variables were no longer working in the snippet preview.
• Fixes a bug where the $post global was emptied by our Frontend class, causing conflicts with other plugins.
• Fixes a bug where variables weren’t replaced in the og:description meta tag.
• Fixes a bug where the breadcrumbs caused an undefined variable notice.
• Contains an incredible amount of code style improvements, making the code cleaner and more readable.
• Makes sure every function in the plugin is documented using PHPDoc by having it checked automatically by the Codesniffer.
• Refactored a lot of legacy code in the admin, mainly with regard to the way output is rendered. Provides for a better separation of concerns, making the code more comprehensible and re-usable.
• Deprecated a large amount of form methods and moved them to the Yoast_Form class.
• Deprecated a large amount of utility functions and moved them to the WPSEO_Utils class.