I can tell you this has something to do with administrative settings. This happens for our users but not on my administrative account. And when I give the user administrative rights, they no longer have the issue. I'm going to review the ADMX files for 1903 and see if I can find some kind of group policy setting that needs to be adjusted.
I am also seeing the same behavior on my end. Admin accounts work, but standard users don't. So obviously some permissions broke during the upgrade. I've tried checking the folder permissions for C:\Windows\System32\spool\drivers\x64 but that is not working either.