does not auto-run at login
The installer will put a link in the Startup folder if you wish DPS to run at login. Is DPS in your Startup folder? The location in Windows 8.1 is C:Users(USERNAME)AppDataRoamingMicrosoftWindowsStart MenuProgramsStartup
The hardware hdmi sound output device is not visible in the panel does not adjust the volume with dps
When you click the volume control in the taskbar, do you see two volume controls? You should have audio meters in Digital Power Station and your HDMI output. When the HDMI device is connected and working does it show up in the Output Device drop down menu in the Settings tab?