Yup, looks like the Taiji-uino clone skipped a component. There's no crystal.
If you un-comment the line:
RTC_clock rtc_clock(RC);
...it will work on the Taiji-uino. Thanks for clearing that up Markus and btw, your work around here is much appreciated. Electric house can't exactly skimp on an RTC because it's baked into the silicon!