I’m having the same problem. Same software and hardware version as gadgetboy. The OSPi ran fine from 2013 through last season with the original (2013) firmware. I upgraded to the latest (2.1.7) and none of the stations run. The Raspberry Pi is a Model B Rev 2 (000d). Are there any known issues with older hardware and newer firmware?
The power supply is putting out 26 volts AC. I checked the voltage across the terminals when a station was set to run manually – nothing. I checked /etc/modules, w1-gpio is not listed (only snd-bcmXX).
Are there any other troubleshooting steps I can take, hardware or software? How can I get older firmware versions to try downgrading?