New
#30
well Cliff S, KB4489899 causes that problem only if there are multiple audio outputs or playback devices for Realtek HD audio (speakers, realtek digital output [SPDIF], etc.) and the output selected is not the "default audio device."
If only the "Speakers" output is listed on the Sound properties playback tab for Realtek audio (usually on ALC2xx codecs), then KB449899 is safe to install.
you may want to mention this in the Realtek audio sound threads to those using win10 v1809
Otherwise, wait for the next cumulative update in late March and skip KB4489899, which I will do