However, we still believe that DOMAIN\username parsing with Fast Printer is an important and valuable feature for the SavaPage project. In many enterprise environments (especially AD-based infrastructures), Fast Printer combined with domain-based authentication is a common and scalable use case.
Since the exact same configuration works without any issue on v1.6.0, and fails on v1.7.0, this still strongly looks like a regression introduced in the newer version.
Even though we have a workaround now, having proper DOMAIN\username support restored for Fast Printer would significantly increase the value of SavaPage for Active Directory environments.
We are happy to provide logs, configuration details, or perform tests if needed to help identify the root cause.
Thanks again for your support.