SORRY to be adding a question and not a solution. (Please note I am not the developer - and he is not very available right now so I am trying to find an answer myself as it may be a simple PHP file change that even I can do):

I could not find this exact issue anywhere on the thread: we have installed the Add to Wish List button on the product detail page but when you click on that button it adds the item to the SHOPPING CART and not the WISHLIST. If you use the button in the side box it works, but our side box does not show up on the product detail page.

Any ideas? Thank you in advance.