Wishlist Malfunction

Greetings,
I have ZenCart 1.3.7, installed at my store: https://www.al-qemi.com/store

Wish list has worked in the past, but now it's not, I got an e-mail from a customer that she couldn't add anything, and she's right! When I try to add anything to wish list using the "Add To Wish List" button, I am taken to my current list, but the new item is not added. When I try to "delete" an item already on the list, that doesn't happen either. There are no error messages, it just doesn't do anything.

I had one customer say a while back that wish list wasn't working for her, so I tested it then, and it worked, so it has worked at some point. I don't know what version of wish list I have, but if someone tells me where to look, I'll find out.

Any ideas?

Thanks!
alkemi