Cannot export any footage.

The encoding sequence dialog box just sits there at 0%. No CPU or GPU resources are used. The same problem occurs on both exports from within PPro and via Media Encoder. As far as I know, there are no errors produced. The only thing I can do is hit "cancel" inside of the encoder dialog box in Premiere or Stop in media encoder. No files are generated.

I used to be able to export until a few months ago. One of the recent releases changed that and now seamingly there is nothing I can do to export anything, no file type setting or anything. 

One clue that might help is after I "cancel" out of the export dialog box, when I play back the sequence in the timeline, I get audio but no video is show in the program video monitor. It is black/blank. Before the export, the video in the program monitor looks fine when playing or scrubbing. I have to restart Premier to be able to see my video in the sequence playback vide.

How to I go abourt troubleshooting? I do not use Premiere often any more, but now that I need to do a project, I need it to export video.

I am on a pretty high end windows I9 system with 16 physical cores and 24 logical processors using Windows 11. 64GB ram and RTX-3070-t1 GPU. Drivers are up to date.