This update was launched on the 15th of November, to prevent a bug from the product page when using classic variants style and the "hide out of stock" option:

How to manually apply the fix

  1. Go to the theme editor (read this article for more info)
  2. Choose /assets/js_plugins.min.liquid file and replace the entire content with the following code:
  3. Choose /assets/js_products.min.liquid file and replace the entire content with the following code: .
  4. Choose /assets/css_main.scss.liquid file and add the following code in line 8933 exactly as in this screenshot
  5.     &.disabled {
        color: rgba($textMain, .16);
        pointer-events: none;
  6. Save all files!
Because both the js files and the stylesheet file are sensitive, the code will break if one of these instructions is not respected exactly (deleting a closing tag for example or not pasting the entire code won't work).  Please update the theme using a backup theme or undo the changes if something doesn't work. 
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