Attaching the Mini TT1 to the 1DX (latest firmware) causes the LCD screen to go blank, This has never happened before, I upgraded the Mini TT1 to the latest firmware and the same thing happens. This firmware is made to work with the 1DX, not sure what I am doing wrong. The TT1 works fine on the 5D MKIII.
When this happens it requires the battery to be removed and reinserted for the 1DX to work again?

