1. No, I didn't try clicking the fields themselves, I'll try that.
2. I did already research superior farming, in order to reach the granaries. Two of those gave me an extra food for a hut, allowing my main city to reach level 3 and then...
3. Built a wheat farm in my main city, through the normal build window. Which led me to believe the wheat farm was a level 3 building, but the building desc. says level 1.
I have another city with two fields, but still can't build on either of those. I'm going to go try clicking the field themselves and see what happens. This bit has slowed my empire to a crawl since they are my only food sources.
_
Clicking the fields worked. Awesome. Dang man I was stuck with 3 level 2 cities for the last 152 turns...