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It turns out the issue was associated with our simple openings and the assumed value for "density difference for two way flow". Somehow a value of "1" had gotten into the file for each of our doorways, when a better value is 0.0001. I have tested the file now through a number of iterations and it seems to be working fine.

We are having success in using a 'leak' as the return path connecting the zone to an adjacent zone.