After a update to my AMD Catalyst Control Center, the HDMI Output sound no longer works. This happened once before and I clicked "Roll Back Driver" which solved the problem. This time, that button is grayed out. I've tried uninstalling the whole suite and installing older versions like 14.9 and 14.12 but nothing seems to work. Even tried reverting to Microsoft sound but still don't get anything. Does anyone have any suggestions? Would greatly appreciate any help.