The problem happens with every kind of devices and browsers (Firefox, IE, Chrome, Android 5.0, Android 4.3, iOS 8, ecc.).
As far as I’ve read, it looks like these problems can be caused by using images that were present in the wordpress gallery before installing the theme. Correct?
So I’ve just tried to create a custom gallery inside the “homepage” page; it looks like it’s working now (though I’d really like to make it work as it’s supposed to). BUT, now the homepage text has become grey.