I have found the issue.
Since the latest update from WooCommerce, there is a new <div> added in the html structure. This causes any targeted CSS to no longer work.
The div is:
<div class="variable-item-contents"> </div>
To fix the issues, add .variable-item-contents
wherever needed in the CSS to make sure the CSS targets the html properly.
Colour & Button Swatches no longer working
P Vos
As posted by many other users, the variation switches are no longer displaying.
When will a fix be released as this is essential for my website?