WordPress SEO was updated to version 1.4.23, from version 1.4.22. Changelog:
- Fix for serious sitemap issue which caused all pages of a split sitemap to be the same (show the first 1000 urls)
- Fixed a bug in the WPSEO tour in WP Network installs
- clean_permalink 301 redirect issue when using https
- Updated cs_CZ, fa_IR, fr_FR, hu, hu_HU, pl_PL, ru_RU & zh_CN