Of late when I tried to export from Premiere Pro this is the screen that I got. And this after the them getting rid of the old export window for this new monstrosity (please see this very long thread at Adobe on the monstrosity).

For a little while there I could get it to work if I trashed my preferences and re-synced and the export would work for a few seconds, but this stopped working.

Then thanks to this thread at Adobe, I found that deleting my 23.0 folder from User/Username/Documents/Adobe/Premiere Pro fixed the problem for a single export, then it stoppwed working.

So then I have been using Media Encoder to open the Premiere Pro sequences directly. The Media Encoder version that I had been doing above, reset premiere pro preferences which worked for a while, and 3 the Match Sequence Preview Settings, but I can’t even get to the Export window for that to show up.

Well Finally Adobe has admitted the issue, and posted about it with work arounds.