On Friday, 19 Sep 2014 at 09:14, Andreas Kiermeier wrote:
> Having used this type of setup only over the last couple of days, I've
> come up with another question. It appears that the setup_fu is
> executed twice ... once as it's own source block (though by itself not

maybe say ":results none" instead of silent?
just grasping a straws here.  
-- 
: Eric S Fraga (0xFFFCF67D), Emacs 24.3.1, Org release_8.3beta-372-gdd70cf