Can't export from CH when I've edited two scenes together

I've edited two scenes togther in CH. I can't export that edit out. I get the message below. This is the same PC/GPU I've been using with CH for three years.

Oddly I can still export the scenes individually (crisis overted...more work to be redone tho!)

This seems like a bug to me. Here is my PC and GPU info:

Device name DESKTOP-1CL7LBR
Processor Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz 3.19 GHz
Installed RAM 16.0 GB (15.8 GB usable)
Device ID B41109CC-CAD8-40CB-9C74-E96FA8D48A5C
Product ID 00325-81126-10175-AAOEM
System type 64-bit operating system, x64-based processor
Pen and touch No pen or touch input is available for this display

Do I really need a new graphics card already??