Display Author Pane in view (with Display Suite View Mode)
For anyone who ends up in my same situation, I will post the answer.

Author Pane is only prepared to be displayed on full view nodes, but not in View's lists or Display Suite custom view modes. This is because calling the function "menu_get_object()" will not retrieve anything.

What you need to do is to alter Author Pane's function "author_pane_get_block()" or find a way to implement a hook to do the same thing properly.

I quickly edit the first condition removing the numerical condition of arg(1) and after $node = menu_get_object() line, I check if node is not set, and in that case, I assign $node variable the current view node from somewhere in the context. (in my case, I could get it from Display Suite context, but you can get it from anywhere, including (in the worst case) the stacktrace arguments.

Hope this helps someone!