Hooray! Try #2 worked like a charm. Seemed the problem with my first batch was that the pricey organic milk was ultra-pasturized which doesn't work with the crockpot365 recipe - the yogurt doesn't thicken, which happened to me. So, I used regular whole milk (just plain pasturized) and sprinkled about 1/4 cup of powdered milk into the yogurt starter to mix in with the warm milk on my recent try. I also kept better track of when the milk reached the 180-185 degree mark, and then when it cooled to 110, using my candy thermometer. In my first attempt, I had just followed the recipe time estimate "2 1/2 hours on low" etc. In fact, my milk needed 3 hours on low and then a brief hit on high in the CP to reach the 180-degree mark. That surprised me. Followed by 3 hours unplugged to cool to 110 degrees so that the starter and milk powder and vanilla could be mixed in, then the unplugged CP was wrapped snugly in a towel for 6 hours to stay warmish so the yogurt could develop...and yes, thicken! Seems the longer it sits in this last phase, the tangier the yogurt - I will need to experiment a bit with this last bit.
Good luck to anyone who tries this - it is fun! (When it works!)