For some reason, my counter circuit (photo attached) is not working. When I close the switch connected to the 'load' pin, the output (indicated by the blue LEDs on the right) should begin to count up. When I close the switch, however, the circuit does not count up, and the LEDs remain in their set values. I'm fairly certain I haven't made a design error as I built this exact circuit on my breadboard and it functions as expected. I'm relatively new to Multisim, so I'm wondering if I'm missing something. Any help you guys can provide is much appreciated. Thanks!