Hi @sachristan,
Our plugin is compatible with the latest WooCommerce version. The issue with double “Add to Wishlist” button appears because of an outdated ../single-product/add-to-cart/variable.php that your theme probably overrides.
In the latest WooCommerce version the hook was moved from:
../woocommerce/templates/single-product/add-to-cart/variable.php
Into:
../woocommerce/templates/single-product/add-to-cart/variation-add-to-cart-button.php
So, we suggest you to check if your current theme is fully compatible with the latest WooCommerce version and ask the theme developers for an update if necessary.
Regards,
Stan