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I tried the default TripleRand, and HepJamesRandom generators, via GlastRandomSvc.RandomEngine. In both cases, the generated value was non-zero up to the return from the function, but was zero outside it. I'm at a loss as to where the value went. I looked around on the floor beside my laptop, but nada.
Further investigations on BackGndAvg source (JME)
I recompiled FluxSvc with v6r2p1, but using version v8r13 of flux. The problem went away. It seems likely that some of the recent clean up of the flux package may have cleaned a littl too much...