It is obvious that the developers had some difficulty with shields. They started out as defensive melee weapons and then the Inquisitor handbook added the possibility to use them for cover. Then with Ascension they added permanent cover for the arbiter shield on the body and shield arm. Which when you consider that if you rule that shields count as cover makes sense. After all, your body and shieldarm is 'covered' all the time when you lug one of these around.
I checked out the living errata and they don't say a thing about the shields in the basic book and the inquisitor handbook. So what I like to know is, what are shields supposed to do right now?