Your theme is in the last version, and woocommerce too, since your lastupdate of your theme, the plugin
WooCommerce Product Add-ons last version 2.7.0 not works with your theme Blanco, i cannot on a new product add a addon. when i clik on the button “new addon group” in general product, that not works
I contacted woocommerce but not answer, and i wait equally you check this problem.
thank’s i gige you my private content for check
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I have the same issue. I use IDStore + WooCommerce + WooCommerce Product Add-ons, all new setup (latest version). If no add-ons for products, cart is working fine, if I use add-ons, adds nothing to the cart.
Do I understand right that this is a WooCommerce issue?