There is a bug by the ender IO quest. U need to paint a Facade into a diamond block, when i did that, I couldn't accept it. I tried it too on the Quest Deliver System and it won't work too. I tried to place it and break it didnt work either.
As I recall, EnderIO ether isn't in AG2, or i've just managed to miss it this past month xD Do you mean AG+?