Hi Diego, please open a Ticket for theme issues, since we do not give support in the Forum, neither by e-mail.
We've fixed this issue a long time ago, go to: app/design/frontend/default/hellosixty/layout If you have a file called wishlist.xml ,so remove it.
Then go to: /app/design/frontend/default/hellosixty/template/page/template If you have a file called top-links.phtml ,so remove it.
The top link wishlist should work then. Let us know (by Ticket).