P: Export As error: "An unknown error occurred"

Hi Richard, Jeff,

Sorry for the trouble we caused. We cannot reproduce this in house and like to investigate.
Could you send me your test files?

Guaranteed to get this error if anything is selected before doing Export As.  Even if nothing is selected, I have to wait after EVERY change to the configuration of the dialog to not get that Unknown Error.  Change from PNG to JPG, wait for the preview render.  Change from Quality 100% to 77%, wait for the preview render.  Change Width from native to 2048 (for exporting to social), wait for the preview to render.  Change the Embed Color Profile to be enabled, wait for the preview to render.  So long as I wait for the previews with every change, it works.

Windows 10 Pro, latest version of Ps in January 2019, video drivers fully updated (NVIDIA), 32GB of RAM.

Please, please. please just don't do the preview render!