WordPress 4.5.1 Is Out Fixing 12 Bugs

WordPress 4.5.1 was released today fixing 12 bugs.

WordPress 4.5.1 is a maintenance release following WordPress 4.5 that has been downloaded about six million up until today.

I warned people to wait a few days before upgrading to version 4.5 as it was a major release. I suppose version 4.5.1 eliminates most of the risk.

This release fixes 12 bugs, chief among them a singular class issue that broke sites based on the Twenty Eleven theme, an incompatibility between certain Chrome versions and the visual editor, and an Imagick bug that could break media uploads.


WordPress 4.5.1 contains fixes for 12 bugs from 4.5, including:

Build/Test Tools

  • Shrinkwrap npm dependencies for 4.5

Bundled Theme

  • Twenty eleven page templates with widgets incorrectly styled


  • Customizer Device Preview: Use px units for tablet preview size


  • Database connect functions can cause un-catchable warnings


  • Fix support for Safari + VoiceOver when editing inline links


  • Emoji skin tone support test incorrectly passing in Chrome


  • Feeds using an rss-http content type are now served as application/octet-stream


  • Fatal error: Undefined class constant ‘ALPHACHANNEL_UNDEFINED’
  • wp_ajax_send_attachment_to_editor() bug
  • Don’t cache the results of wp_mkdir_p() in a persistent cache

Rewrite Rules

  • Duplicate directives in web.config after WordPress 4.5 installation on Windows


  • WordPress TinyMCE toolbar/tabs unresponsive in Chrome Version 50.0.2661.75 beta-m (64-bit)

For more information, see the release notes.

You can Download WordPress 4.5.1 or venture over to Dashboard → Updates and simply click “Update Now.” Sites that support automatic background updates are already beginning to update to WordPress 4.5.1.


About Konstantinos Zournas

I studied Computer Engineering and Computer Science in London, UK and I am now living in Athens, Greece. I went online in 1995, started coding in 1996 and began buying domain names and creating websites in 2000. I started the OnlineDomain.com blog in 2012.

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