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"RE: D300/MB-D10 grip controls not working"
I recall having a similar problem twice.I turned off the grip and the camera, disconnected the grip, and removed both batteries. After reversing the procedure, all seemed to work well.Haven't had it happen again in the last 2 years.As a last resort you could perform a reset on the camera in the hopes of resetting the connection between the grip and camera.Hope this helps.Ralph in CT