Since removing and reinstalling several driver versions using the full DDU package i'm having an issue I cant solve where the following happens.
Each time I reboot my HDMI audio device shows a red cross and nothing is selectable in there, audio seems to work however but I cant tell if its set to stereo or 7.1 as it should be. To resolve this I have to right click and trouble shoot, this then brings back the device. The annoying thing though is it sets it to default to stereo so I have to change that as well.
I've tried capturing the REG keys and having those merge at logon but that doesnt work either. I've done a full DDU uninstall and that also failed, rebuilding my OS is NOT an option so i'm hoping someone has a fix for this.
fixed it, turned out to be registry permissions on MMDEVICES, audiosrv has inherited all permissions for all keys somewhow denying access to sytem and local user, so windows audio couldnt logon.