Alvin got it. The bus bars were reversed. The smoke is not shown in the video, that occurred previously and was not captured on tape. I then went back to the instructions and realized I marked the bars based on the instructions on page 32 ("Also, make sure B- is attached to the bottom, and B+ is attached to the top.") after I had assembled the whole board. I was not paying close attention that what was the bottom on page 32 is now the top and vice versa and therefore marked the bus-bars incorrectly. Might I recommend, when the instructions are revised, a note stating which bar is which on the last page for the less educated like myself.
