Advanced post type order doesn't sort on front end

Hi Riccardo,
We had this issue before with Advanced Access Manager, it restrict certain WordPress core filter execution for certain users types or non-loged-in, definitely not a good thing as it will create problems with allot of other code.
You should change the settings within that plugin accordingly and remove such restrictions. I can’t say exactly where/which is that, but you should give it a try, it should be explicit. If you can’t find it, please get in touch with us and someone will check that for you.

Thanks