I read in the user manual that
But when I set up the jumpers and straps according to the wiring diagram figure 12 on page 18 in the manual and run the buttons program my raspberry pi registers the button presses, but no LEDs on the Gertboard light up.The jumpers on the ‘out’ area of U3 (U3-out-B1, U3-out-B2, U3-out-B3) are optional: if they are installed, the leftmost 3 LEDs will light up to indicate the state of the switches.
When I look at the photograph of the wiring on page 18 I see the power jumper installed in header J7 like on page 10.
When I install that jumper all the LEDs on the board light up and button presses make the corresponding LED turn off instead of light up.
Is this working as intended or is something wrong?
I also wonder if I have to power down my raspberry pi when I change straps and jumpers. When I make changes or remove the board while powered on the raspberry pi often crashes.