We invoked the normal automatic upgrade of our 3CX 15.0.0 instance within the "Updates" view as presented by the application. It provides the upgrade from 15.0.62928.5 to 15.5.1694.0. There appears the confirmation dialog and when pressing ok, the diversion to the login page happens. However, the upgrade doesn't happen and there is never any mail sent about success or failure and as well there is nothing visible about the problem in any logs anywhere. Up until now, such upgrades worked without problems. The system is a Windows 2008 SP1. Any hints about how to resolve this are highly welcome.