Hey Wayne! As discussed, the Standard ERP Server architecture is designed so that when some maintenances or large reports are run, especially on Main Thread - it will stop clients to complete the maintenance or print report. In newer versions of 8.5, we have added Parallelity functionality to stop this from occurring (allows users to work completely without being affected during maintenance), but Parallelity has not yet been applied to work for every maintenance. Our goal is to apply this functionality to all maintenances and reports so that no user is affected during the time it is running. We will update you as more progress with this functionality occurs. Thanks!

Best Regards,
Omar