I discovered a few days ago that you can change settings for individual friends, so you see all posts, some posts or only important posts. Go to your friend's profile - there'll be a 'Friends' button at the top. If you click in this it produces a drop down menu with options on, see if that helps.
Oh, and check that when you're viewing your newsfeed you have it set to 'most recent' and not 'top stories'. You have to do this every time now as it keeps resetting.