So Friday I had an employee come to me that they could not print. Scratching my head I did the normal things, restarting, checking updates, re-installing printer drivers and letting Windows trouble shooter fix it. Nothing worked. It was the end of the day and I decided to try Monday. Coming in Monday we now had several users with the same issue.
Turns out MS, began pushing out a security update which seems to vary in it's KB XXXXXXXX name but it will be the latest one since the 1st of October if you too suddenly can't print. I can verify this affects 1803 and 1809 as well not just 1903.
Here is an article on this from Bleeping Computer: