I had the same problem and think it happens when you inflate the layout in the Fragment’s onCreateView with null, like you did here:
mRootView = (ViewGroup) inflater.inflate(R.layout.list_content, null);
Instead you have to do this:
mRootView = (ViewGroup) inflater.inflate(R.layout.list_content,container, false);
Where container is the Viewgroup. At least, that solved the problem for me.