Here's what I've done for the incrementer:

Add16(a[0]=in[0], b[0]=true, out[0]=out[0]);

Add16(a[1..15]=in[1..15], b[1..15]=false, out[1..15]=out[1..15]);

This seems pretty straight-forward to me, yet it still doesn't work. I figured it might have to do with a bug in the Add16 chip, but I've tested it multiple times, manually and with the supplied test file without failure; works great.

Here are the test results from manually playing around with the Inc16 in the HardwareSimulator:

**Input/Output Pins ** input: 00000000 -> output: 00000001

input: 00000001 -> output: 00000000

input: 00000010 -> output: 00000011

input: 00000011 -> output: 00000010

**Part Pins:** a[0] in[0] 0000000000000001

b[0] true 1111111111111111

out[0] out[0] 0000000000000000

a[1..15] in[1..15] 0000000000000001

b[1..15] false 0000000000000000

out[1..15] out[1..15] 0000000000000001

Any help or advice would be appreciated. Thanks!