On February 2, Microsoft released the KB4598291 update, which, combined with Discord’s in-game overlay feature, crashes WoW.
Initially, some Reddit users thought that the latest Windows update was responsible for the crashes, but it turned out it was Discord’s in-game overlay all along.
Image credit: Qahlel
Microsoft had this to say about the bug, and all you need to do is turn off the in-game overlay in Discord settings and update the app to fix the problem.
Microsoft and Discord have found incompatibility issues with some games using Direct3D 12 when the in-game overlay feature of Discord is enabled. When attempting to open affected games you might receive an error, or the game might close silently.
To mitigate this issue, you can turn off the in-game overlay in settings within the Discord app.
This issue is now resolved in an update to the Discord app. To verify you’re on the latest version, right click on the Discord icon in the notification area and select “Check for updates…”. If there are updates to install, it should install automatically but you might need to select the arrow icon in the upper right corner of the app to install the updated version. There is no update for Windows needed to resolve this issue.
(Source)
Source: Reddit
