5.5 causing responsive theme problems

[garrychain]

I would like to begin by congratulating WP 5.5 which is indeed faster than any other previous WP. However after the update 2 problems developed which weren’t there before:

1 – When visiting a post, in the comment section it no longer shows the logged in user as logged in, the user has to insert username and email as if he’s logged out. If the user leaves blank and just types something in the comment box, same story.

2 – The theme we use is responsive, heavily customized and it has a responsive menu button with 3 lines which used to show up only when the page viewed was below a certain resolution, now after the update the button shows up on all resolutions and not only that but it doesn’t even work anymore, clicking or tapping on it, does nothing. We don’t know how to fix this from our side as the button was already perfectly functional in previous WP versions. There seems to be a problem with WP 5.5.

Something fundamentally changed in WP 5.5 and hopefully that something will be fixed in the next update 5.5.1… We already tried the plugin trick by disabling all, flushing cache, etc. something changed in the core of 5.5 which is causing this. Until this is fixed in future updates, we’ve downgraded back to 5.4.2.

Thank you.

[afercia]

Welcome @garrychain and thanks for the report.

These issues may depend on a change in WordPress 5.5 related to the jQuery library. Are you seeing any JavaScript errors ​in your browser console?

If so you might need to check the information on this support topic under the section "jQuery Migrate is disabled by default": ​https://wordpress.org/support/topic/read-this-first-wordpress-5-5-master-list/#post-13238244

If that is the case, it means one or more of your plugins or the active theme are using JavaScript code that is incompatible with the jQuery change in WordPress. Ideally, these plugins (or the theme) should update their code. If no update is available at this time, there is a "jQuery Migrate Helper" plugin available on the support topic, please see the instructions there. If that solves the issues you're experiencing, please report back. That would be much appreciated so that issues triggered by this change can be better tracked :)

More technical info about the jQuery change:
​https://make.wordpress.org/core/2020/06/29/updating-jquery-version-shipped-with-wordpress/

[desrosj]

Since this should have been a support forums topic instead, and @garrychain has opened a topic since this ticket was created, I am going to close this out.

I left the same suggestion made above by @afercia on the support topic.

[desrosj]

Forgot to include a link to said support topic: ​https://wordpress.org/support/topic/5-5-causing-responsive-theme-problems/