P: Noise reduction effect not displayed in Develop mode

So they've merged in problems that are different into this one thread which is "fixed" even though some issues are not fixed! 

Merging with another topic.

Please reference the new conversation here: Noise reduction not being applied in Library module

I have also reported this. 
https://feedback.photoshop.com/photoshop_family/topics/lightroom-classic-library-preview-not-showing...

Another person with possibly similar symptoms: https://feedback.photoshop.com/photoshop_family/topics/bug-report-what-is-that-develop-module-not-tr...

To other moderators: Note that Todd's report and that other report, both concerned with Library, are different from the rest of the reports here, which are concerned with Develop.

Yep, me too I can confirm, glad they fixed it, not a driver problem after all as we have been repeting.

I confirm. After last update, the image in old LR CC and new LR Classic are the same. NR is displayed in 'fit' and 'fill' and '1:1'. GPU enabled.

It does Luke. 

Does today's update fix this? I'm hesitant to install any further update

This fixed it for us too:  "I've disabled the "Use GPU" in the menu and restarted lightroom.  Without using GPU acceleration normal behaviour is restored, it renders NR and Sharpening in fit and fill views.  Re-enabling GPU functions and it stops again."

It drove us nuts for like 4 hours, trying to fix it. You saved our sanity. 

Its almost like businesses want to know how long problems will last so they can plan accordingly ...