Windows 8 won't shut down after SyncBackSE runs

Hello there. I have SyncBackSE 6.5.15.0 running on Windows 8.1 64-bit. I just upgraded from Windows 7 64-bit to 8.1. I had scheduled to run SyncBackSE to run at shutdown.

With Windows 7, the profile ran to completion and the PC shut down. With Windows 8.1, the shutdown dialog shows up, the profile runs and then kicks back to the desktop. Is there any way to force Win 8.1 to shut down after SyncBackSE completes or is there a SyncBack setting to help override this behavior?

Thanks!