Everything looked fine. The cordwood walls were still damp, but most of the logs had no signs of water from the initial mortaring. After my heart stopped racing, I decided to make a few phone calls to the cordwood doctors. Doctors Rob Roy and Richard Flatau were unable to diagnose the problems. Both doctors had never heard of such a thing.
Ideas abound such as air bubbles snapping, wood contracting, mortar contracting, etc.
Visually everything looks great. So, I guess I'll just keep an ear out for further sounds. Progress During the last week, I was able to make some good progress. At this point, I feel very confident about the mix I am using. During my building of the first two walls, I have tried four different mixes.