To be honest, I've only ever checked in. If I want to start over from the last release I just go to
http://opengauge.googlecode.com/svn/...no/mpguino.pde and cut and paste the program back onto my pc.
Also worth noting that the version there is the last arduino compatible version, as mentioned with the last update notes:
http://ecomodder.com/forum/showthrea...html#post93357