I've moved this thread to the qDDB board. I can only think that it might be an incompatibility of qDDB with the 6DMK2 - but I guess only Zoltan (the developer of qDDB) could really say something about it. I hope he reads here. Otherwise you might want to contact him via dslrdashboard.info. Unfortunately I cannot give technical support for qDDB since I'm not the developer.