Windows 10 did the forced update on my laptop on 5/21/18.
Had an older version of Audacity; set up to record from computer as always, and got the error message “Error opening sound device. Try changing the audio host, recording device and the project sample rate.” Double checked my settings against the tutorial, no change. Opened an mp3 from my library, played it just fine. Tried to record again, same message.
Went to Audacity help site, noticed change in version. Uninstalled older version, installed version 2.2.2; verified settings again versus manual; getting same error message. Pretty new to Audacity, not sure what to do next.
Settings: Turned off Software Playthrough;
Host Dropdown Menu: tried both MME and Windows WASAPI,
Recording Device set to Stereo Mix (Realtek Audio);
Recording Channels set to 2 (Stereo)
Playback Device set to Speakers/Headphones