>Anly when cliking on the Add button for the whish list

The Add button, so as any other functionalities of the list, does some JavaScript processing. Among some things, we check to see if the user is logged. If not, we fire the login prompt. Otherwise, we proceed with the option. I really don't know why your browser is chocking on it. You might want to clear the cache and restart it to see if it will continue to act like this.