Tonight I pulled a latex tube out of my rear wheel that had developed a slow leak over the weekend, and then was leaking somewhat quicker during this morning's ride so that I had to refill it during the ride to make it back home.
It appears that I micro-pinched it a little with a tire iron while swapping the stock tire that came on my new bike for this new Compass 32mm tire. Kind of wierd that it took a week to really turn into something. I patched it and put it back in. The tire had stretched out enough after a week of riding that I was able to get it on, albeit with difficulty, using just my hands.