[ravagernl]

Originally Posted by Phanx [...] This will preserve your old video, sound, and other system settings.

For reference, MayronUI only sets the uiScaling option for the different profiles:

if SCALE_TYPE_SET == "1920x1080" then
		ConsoleExec("useUiScale 1")
		ConsoleExec("uiscale 0.7")
	elseif SCALE_TYPE_SET == "1680x1050" then
		ConsoleExec("useUiScale 1")
		ConsoleExec("uiscale 0.7")
	elseif SCALE_TYPE_SET == "1600x900" then
		ConsoleExec("useUiScale 1")
		ConsoleExec("uiscale 0.75")
	elseif SCALE_TYPE_SET == "1440x900" then
		ConsoleExec("useUiScale 1")
		ConsoleExec("uiscale 0.75")
	elseif SCALE_TYPE_SET == "1366x768" then
		ConsoleExec("useUiScale 1")
		ConsoleExec("uiscale 0.8")
	end

Have you tried switching the video mode for wow? It might have switched to fullscreen, or maximized window (and maybe that is causing the issue).