Windows 10 May 2019 Update has received yet another cumulative update which fixes a number of bugs including an issue whereby the audio had gone wonky in certain games.
The freshly released KB4517211 fixes that particular gremlin which was introduced by the previous KB4515384 cumulative update, which itself was brought in to resolve a bug whereby Cortana was causing high CPU usage.
Essentially, the fix for the Cortana problem broke game audio in certain cases (as well as demolishing search in the Start menu and Taskbar, we might add), and this new patch is the solution to that.
