Various Problems with WP 5.6

I have the following problems with my website:

  • When I go to edit a post, I get a blank page. Nothing loads.
  • When I click “Quick Edit” on the “Posts” page, the post disappears (although reloading the page brings it back)
  • “Select All” no longer works
  • The pop out menus on the left (ie Posts –> All posts etc) do not work
  • When editing a post, I cannot click any of the options under the “Publish” menu, ie “Edit”
  • I have of course tried changing the theme and I have deactivated and re-activated all plugins. None of this makes any difference. The only way I can post or edit a post is by installing “Classic Editor” plugin. This is not an ideal solution and only fixes that one problem. Everything else remains.

    What else can I try to fix this? Am I missing something obvious?

The page I need help with: [log in to see the link]

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