Categories not working suddenly

  • I have a serious issue with my categories. IN the Post Edit screen, the Category list is empty when the tab “All Categories” is selected. There are, though, several categories available, all of which have been available normally…! The “Most Used” categories does indeed list the most used ones, but if I select one, update the post, the selected category is not applied to the post.

    I have deactivated plugins, but that had made no impact.

    The theme has been in place for ages and all has been working OK previously.

    What could be wrong?

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