Windows deploys User Account Control (UAC), a protection mechanism which improves security against unauthorized or unintentional access to various system resources. As AWS Client was not initially designed to operate with UAC, the settings on your computer may prevent AWS Client from operating properly.
AWS Client does not give a single identifiable error message, but UAC can affect communication between the QML data logger and AWS Client, for example, the cleanup operation does not work. To avoid this, make sure that you run AWS Client in administrator mode.