Further inspection appears to be an issue with log.json. OSPi seems to be escaping all the quotes for the first log entry, producing the following line:
"{\"program\":\"Run-once\",\"station\":7,\"duration\":\"01:00\",\"start\":\"00:16:55\",\"date\":\"2015-01-24\"}"
This is causing the mobile app plugin which parses the logs file to break.
I have submitted this issue to Dan’s Github: https://github.com/Dan-in-CA/OSPi/issues/87. Hopefully Dan has some insight why this might be occurring.