Add and Remove from wishlist doesn’t work

When logged in, the add to wishlist button works.
When not logged in, it doesn’t work.
In theme options I did not set it to ‘only for logged in users’ so it should work for guests.

Also when I click the ‘X’ to remove an item from wishlist when I’m logged in, it does nothing.
Can you help me out?

Thanks!

PS: I’m using Breeze for caching and I excluded the wishlist page from beeing cached.