Microsoft released update KB4469342 for Windows 10 version 1809 (October 2018 Update) to fix several problems, but the update has problems of its own, including:
After installing this update, users may not be able to use the Seek Bar in Windows Media Player when playing specific files. This issue does not affect normal playback. According to Microsoft a resolution will be available mid-December 2018.
Also, nVidia has notified Microsoft of an issue where Microsoft Edge may crash or hang while playing video. This issue occurs following an nVidia driver update. nVidia has released an updated driver to address this issue.