Has there been any reports of DR just kind of... stopping to work while rendering?
I can't confirm if DR was the problem, as I got no error, but I had a job rendering with 2 machines on DR, everything ran fine for 70+ frames then suddenly it "stops" as in max freezes the render looks like its still going, like max isn't turning white or anything, but nothing actually happens... no more passes from local or DR happens. just sits there.
I just forced closed the job and restarted max, now it's rendering fine again from that frame.... for now anyway. it could be totally unrelated to corona DR, but thought I would flag my experience in case others run into it.