Support » Fixing WordPress » READ THIS FIRST WordPress 4.9 Master List

  • Moderator Marius L. J.


    Hooray! WordPress 4.9 “Tipton” is here! But OMGWTFBBQ!? WordPress 4.9 broke everything?

    Don’t Panic!

    Before you go any further, make sure you’ve updated your plugins and themes to the latest versions, clear your browser’s cache and cookies and re-log into your WordPress dashboard.

    Still having problems? Okay, read on!

    This thread contains the known issues with plugins and themes found in 4.9. Please read this WHOLE topic and come back and check again later, as it will be updated.

    Remember to be calm, be patient, and be respectful. Volunteers are out here to try and help you, but we need your help too. All of the normal forum rules still apply. Remember, you are just as important as everyone else.

    If your post doesn’t show up right away, please be patient. With the higher than normal post volume, more posts get flagged as spam by our auto-spam tool. We’re working hard to keep the queue clear, but making multiple posts slows us down, as we have to go back and check if you already posted. Post once.

    • Do use proper capitalization in post titles and body. Punctuate your sentence properly and humanely, it helps us read.
    • Do use descriptive subject lines. “All permalinks broken since 4.9” is much better than “Augh! Help ASAP! This version is terrible!”
    • Do describe the problem clearly. Explain what you’re seeing, include error messages and link to screenshots if needed. Linking to your site, if the problem is on the front-end, also helps.
    • Do be patient. We know it sucks to be down, but posting multiple times doesn’t get you help any faster.
    • Do make your own topic unless you are using the exact same version of WordPress on the same physical server hosted by the same hosts with the same plugins, theme and configurations as the original poster. You may find it weird, but it will be easier for us to help you specifically if you have your own topic.
    • Do mark your topic as resolved when it’s fixed so we know not to come looking there anymore.
    • Do remember you’re not alone.

    Also keep in mind that not liking the direction of WordPress’s design is a not a bug. If you don’t like a feature, please don’t make a series of posts complaining about it. Look and see if someone already did, and post there, or consider joining the process earlier on (like in Beta or even test via SVN). What you’re seeing today is the result of thousands of hours of work and testing, and unless something is outright broken, it’s highly unlikely to be changed.

    Again, before you post:

    Make sure you’ve read this entire thread and New Features in 4.9 Codex Article.

    Go to your own install’s about page – – to see what’s new.

Viewing 5 replies - 1 through 5 (of 5 total)
  • Moderator Marius L. J.


    Before posting, please make sure you’ve tried started by performing the troubleshooting steps outlined below:

    • Flushing any caching plugins you might be running, as well as server and/or browser caches. Not just your browser, but any op cache or content network cache as well such as Cloudflare. That will solve many weird JavaScript issues.
    • Flushing Managed host caches. Managed WP hosting often has special caches. If your host has a “Purge Varnish” or “Flush Memcache” tool, try that. You can ask your provider to flush memcache and Varnish for you if necessary.
    • Troubleshooting with your browser. Your browser can help you identify JavaScript issues or conflicts and this article can assist you in doing that diagnosis. This could help identify Visual Editor issues as well.
    • Deactivating all plugins (yes, all) to see if this resolves the problem. If this works, re-activate the plugins one by one until you find the problematic plugin(s). If you can’t get into your admin dashboard, try resetting the plugins folder by SFTP/FTP or PhpMyAdmin (read “How to deactivate all plugins when you can’t log in to wp-admin” if you need help). Sometimes, an apparently inactive plugin can still cause problems. Also remember to deactivate any plugins in the mu-plugins folder. The easiest way is to rename that folder to mu-plugins-old
    • Switching to the Twenty Sixteen theme to rule out any theme-specific problems. If you can’t log in to change themes, you can remove the theme folders via SFTP/FTP so the only one is twentysixteen. That will force your site to use it.
    • Manually upgrading. When all else fails, download a fresh copy of the file of 4.9 (top right on this page) to your computer, and use that to copy up. You may need to delete the wp-admin and wp-includes folders on your server (NOTE: do not delete the wp-content directory or your wp-config.php file) Read the Manual Update directions first.


    If you need to create a support topic, consider getting the Health Check plugin to provide debug data for the support volunteers.

    Moderator Marius L. J.


    Core changes

    Moderator Marius L. J.


    Not a bug

    • If you add or remove new page templates or other files to a theme without changing the version number, it may take up to an hour for the changes to take effect. This is due to caching, and is being discussed in #42573 – Reverted in 4.9.1
    • I don’t see the new comment form checkbox. This may be due to your plugin or theme changing the comment form from the default provided by WordPress. It’s also worth noting that the box is only available to anonymous, non-logged in users.
    • This reply was modified 4 years, 1 month ago by Marius L. J.. Reason: Add note about 4.9.6 comment checkbox
    Moderator Marius L. J.


    Known issues

    • Saving posts or pages is not possible in all browsers when using Visual Composer version 5.4.2 or older.

    Plugins with known issues

    • Contact Form by BestWebSoft will cause the plugin/theme editors to time out and not save your changes. Workaround: Disable this plugin to use the plugin or theme editors.

    mySQLi now default

    • As of 4.9.2, WordPress now uses the mySQLi extension by default. If you have plugins or older code that uses the mysql_* functions directly, these may cease to function. Update your plugins to the latest version, or find alternative plugins.
    • This reply was modified 4 years, 7 months ago by Marius L. J..
    Moderator Marius L. J.


    Reported bugs

    • JavaScript heavy pages, such as the Customizer or post editors, break when using languages with formal/informal variations. This is being tracked and has a workaround in #42574 – Fixed in 4.9.1.
    • Theme and plugin editors are unable to save files when hosted on Windows servers. See #42609 – Fixed in 4.9.1.
    • Images with captions in my post are bigger than they should and the background fills up larger parts of the content area. See #42604.
Viewing 5 replies - 1 through 5 (of 5 total)
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