I’ll answer this myself, though kudos to @jacob-peattie for noticing the selection box was non-standard and a likely culprit. So we had the ‘Radio Buttons for Taxonomies’ plugin running (up to date) with the affected taxonomy types selected there. When we removed the taxonomies from there, the problem stopped. But we wanted radio buttons here … Read more
If you can get an older version to work with the database (set up the config file to point to your local version of the DB), then you can try exporting it (via Export tool), and importing into another instance of the latest WP install (install a base site with a new DB). If only … Read more
Editing the core files is not recommended. You may try downloading a clean install of WordPress files. If you can, set the current theme to TwentySeventeen so your database is ready to work with a clean install. Make sure to back up your database if you have not already. Follow the codex instructions to delete … Read more
Here is the solution: Remove the following lines of code from the functions.php wp_editor( “” , “main_text”, array()); wp_editor( “” , “invite”, array()); wp_editor( “” , “mobilemain_text”, array()); Shoutout to @aatanasov on wordpress.org/support for the solution.
Do core themes normally allow automatic upgrades?
In the top right corner, click on Options, from there click on Preferences. Now select Panels from the left side of the prefs window and you’ll find an option to toggle custom fields listed under Additional.
Must-use (mu) plugins are loaded during the version update process, unlike ordinary plugins. Explanation here. So it’s possible to hook dbdelta_queries and the related filters from within a mu plugin. (Thanks to Sergey Biryukov for the answer.) But, some plugins use the same dbDelta() function as core update, so it’s possible to get queries for … Read more
I copied your code to one of my sites to test with ACF version 5.3.9.2. And it works for me I just had to make sure the field name and image size were correct. $size = get_field(‘slideshow_size’) ?: ‘Panoramic’; // Make sure this size exists, and usually is all lower case. $column_id[ $i ] = … Read more
Back up all your files and database And then install wp3.5 and activate each plugin one by one and see whether they are compaitable or not OR you can install a wp3.5 in any other subdomain(domain.yoursite.com) and then activate all those plugins and see if they are compaitable or not
In a nutshell that should be considerably straightforward, WP just couldn’t update itself in versions that far back. Codex has detailed instructions for upgrading from older versions, see Upgrading WordPress Extended. However overall it’s usual for manual update – backup, replace core files, go through upgrade dialogs.