I have an AMD Radeon HD 6800 series. I recently updated the driver to the newest one and since then any time I try to play sound through HDMI it doesn't work. I went to my Sound Settings and tried to test it and it gives me an error "The device is being used by another application. Please close any devices that are playing audio to this device and then try again." I have confirmed via the downloaded tool that I am using the most up to date driver. I am running Windows 7. Any ideas are appreciated.