[wp-trac] [WordPress Trac] #50960: v5.5 messed entire site

[WordPress Trac]

#50960: v5.5 messed entire site
-------------------------+-------------------------------------------------
 Reporter:  saarikko     |       Owner:  (none)
     Type:  defect       |      Status:  closed
  (bug)                  |
 Priority:  normal       |   Milestone:  Awaiting Review
Component:               |     Version:  5.5
  Administration         |
 Severity:  critical     |  Resolution:  invalid
 Keywords:               |     Focuses:  ui, javascript, css, rtl,
                         |  administration, template, multisite,
                         |  performance, coding-standards
-------------------------+-------------------------------------------------
Changes (by jorbin):

 * keywords:  close =>


Comment:

 Hi saarikko, welcome to trac. We do try to encourage respectful discourse
 here, so I have modified your post help with that.

 This Trac is used for discussing bugs in the core software. It sounds like
 you have some problems with your plugins and/or themes. I would encourage
 you to reach out to the support forum or to your theme/plugin authors
 directly.

 If you had not enabled auto-updates, you are best off contacting your
 host.

 All that said, this is most likely an issue caused by a plugin that is
 using old jQuery functionality that will no longer work in WordPress 5.5
 due to jQuery Migrate being removed.
 A summary about that can be found in the "jQuery Migrate is Disabled by
 Default" section of the 5.5 upgrade guide:
 https://wordpress.org/support/topic/read-this-first-wordpress-5-5-master-
 list/#post-13238244

 For more info about that see #37110 and
 https://make.wordpress.org/core/2020/06/29/updating-jquery-version-
 shipped-with-wordpress/

 If you open your web browser's developer console, you should be able to
 see which JavaScript file is causing the error:
 https://wordpress.org/support/article/using-your-browser-to-diagnose-
 javascript-errors/

 You can also try deactivating all plugins and reverting to the default
 theme then reactivating them one by one to pinpoint the issue.

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/50960#comment:4>
WordPress Trac <https://core.trac.wordpress.org/>
WordPress publishing platform