I see that you have now powered Bartok down from the rear panel and the problem disappeared.
It is standard practice when upgrading dCS firmware to power down form the rear panel and then reboot. The upgrade is not finished until this is done as this resets the system. It is similar to when you upgrade Windows and your PC asks to be restarted after installation. I is advisable too to power down from the rear panel and reboot before starting the upgrade procedure.