I worked up the courage (and found time) to troubleshoot the Smoked Propeller Protoboard (see previous post).
Close microscope inspection, and then some Resistance and Voltage Tests revealed nothing unusual.
The only known casualty was the LCD. The last time I was working on the Prop, I must have plugged the LCD onto the Header incorrectly, I think I must have displaced it by one pin. The screen went half Black, and then a little Smoke was emitted (from somewhere)!
Another LCD was installed and now all is working as it should.
So, now back to the Huff-n-Puff experiments.
BTW, Anyone want a slightly used LCD, . . cheap, without its magic Smoke contained? :-)