AI Noise reduction fails on lightroom classic

It fails to pop up the second window on mine after every new import for some reason, however doesn't lock anything up, just fails to happen.  I close lightroom after new import and reopen and then it works fine.

At first I noticed this:

I can see that it loads the initial files

so I wondered if you were applying AI Denoise in batch. But then I re-read your initial post and noted this:

I also typically only run the AI noise reduction on each photo after I adjust it and crop it.  So it's not running on multiple images at once. 

So apparently not. But can you explain that first statement? Mind you a Batch AI Denoise may work.

That being said, another thing noticed

this issue arose part way through the processing of around 250 photos.  

Have you run out of hard drive space for any of the following:

• Camera RAW CACHE
• Windows Temp files
• Windows Paging file

and for the Camera RAW CACHE, what is your setting in LrC /Preferences/Performance// and have you exceeded that limit?

Please show us your system details by copying the information from Help->System Info down to and including the GPU information. We don't need and don't want anything after that.