Language switcher not visible when logged out

Hi,

My site is multilingual, with the internationalization and entity translation modules enabled. The language detection is set to URL. I use the language switcher (content) from the entity translation module to switch between languages.
Everything works fine as long as I'm logged in as administrator. When I log out I can't see the language switcher anymore although the html code is generated.
Is this a permissions thing or something else? Does anybody have experience with this problem?

Thanks.