Before anyone gets too excited about Rietveld (which I originally wrote as an APp Engine demo), AFAIK we're using a fork that only Martin von Loewis can maintain -- and it's a dead-end fork because the Rietveld project itself only supports App Engine, but Martin's fork runs on our own server infrastructure. These environments are *very* different (App Engine has its own unique noSQL API) and it took a major hack (not by MvL) to get it to work outside App Engine. That fork is not supported, and hence our Rietveld installation still has various bugs that have long been squashed in the main Rietveld repo. (And no, I don't have time to help with this -- my recommendation is to move off Rietveld to something supported.)