upgrade and error message

Win 10 Error code 9999 Unanticipated host error- cannot record. Updated to Audacity 2.3.3 very frusrated

Are you using a USB recording device?
Does Audacity have permission to use recording devices? (In Windows 10 it is listed as permission to use the “microphone”)

A little insanity here. I was using record button when that message came up. I used record from one of the dropdowns and everything ok. Then the record button started to work.

Thanks for your help

The recording device may have been temporarily unavailable for some reason - that would cause the error message that you saw.