Board Thread:Questions and Answers/@comment-5954828-20130614060949/@comment-5627887-20130616184922

My first thought was that he's extracting the cobblestone from the barrel by some method other than a storage bus, which means the ME network doesn't have a valid storage location for cobblestone, just that it can pull it from that barrel (if it was an import bus for example, it would have no way to put cobble back), this would result in it seeing the ME chest as valid storage, until he puts cobble into his ME storage at which point it will fill that up instead. Like Ironcaptain said, use a Deep Storage Unit for a start, they're just better, and attach a Storage Bus to it so the ME system can identify where to store cobble, as well as access it.