The JB4 does not effect the 7DCT its on its own system. You most likely have one of the early beta firmware versions or early interface both of which have been improved.
Hook the JB4 up to your laptop & get the versions off the interface user adjustment page.
If you are running G5 ISO you need interface 12/14 & firmware G5_ISO_15C.hex If you are running G5 without ISO you need interface 12/14 & firmware G5_100112.hex
Be sure not use the ISO firmware version if you are not running an ISO board.