I ran into an issue with the Arduino Due clone boards I’ve been offering with the TB2 kits. It seemed the boards wouldn’t start properly when installed in the TB2 shield. After offering refunds and vowing to stop selling the clones, a customer alerted me to the fact that you simply need to press the reset button (circled in red below) on the board after plugging in the power for the TB2 to start properly.
I have a number of the clone Dues left, so I’ve decided to sell on the remaining stock. Just take note of the work-around if you decide to go for a clone. If not, genuine boards are available from Mouser.