I've narrowed this down to a RT issue as it works fine with AB active on its own. As soon as I hit apply the screen will freeze, the audio continues and the settings do apply the next time I open the game. EDIT: The problem only appears on DX12, DX11 works fine but since the update WoW runs much more smooth on DX12 so I'd like to get it working properly on that. EDIT: It's the OSD, with that off everything works fine, I can still use RT to cap my frame rate.
Confirmed the issue, installed WOW and reproduced it. Not sure if anything can be done from RTSS side, as I see exactly the same behavior with this game with other third party overlay. But at least I'll try to bypass it. And sadly no, currently existing profile settings (including using Vector3D mode) cannot eliminate it. P.S. There is no need to create exactly the same duplicating threads in different forum sections, it won't make it answered faster. I'll remove the same thread in AB section.