Well…I was double-checking some of my soldering joints. It looks like this was my problem. I had a very difficult time with soldering all those switches without melting the surrounding PLA. My soldering skills are not the best. I tried to clean up the solder joints, but in some cases the PLA plastic has melted to cover the switch post. I may start over and try from scratch with a second board. Hopefully my soldering skills will improve.