I took one of my old file and I tried to do that background run and for now it is going so I guess it is working. All I could try to suggest now is to troubleshoot it component by component. First take your OS component and disconnect all the inputs leaving only HB Zones connected. Then take HBZones straight after adjacency component, put it into OpenStudio simulation and try to run it. If it work - go to whatever you’ve got next. Let’s say glazing or something - put it into OS, and probably at some point simulation is going to break - then you know where the problem lays. If the issue will come straight after first component with HBZones (as I said before - probably adjacencies) the problem probably lays in OS block.