P: Desktop: Sliders have no effect on editing photo

I gave up and sold my PC and bought a Mac last month. It's clear the Windows version of Lightroom CC does not receive the same attention as the Mac version. I am now running CC 4.1 on an M1 processor and it is a noticeably different experience. Thank you anyway for your help

Reply from Engineering: 

Can you have the customer try to do the following:

• Leave Store Smart Previews Locally checked
• Quit LrD
• Remove the previews folder that is next to the Managed Catalog.mcat file. (This step ensures there are no smart previews on next launch)
• Launch LrD
• Quit immediately after reproducing the issue
• Send us a zip file containing the bad image and the entire zipped previews folder. (We will have up to a couple dozen depending on how many were synced before reproducing the issue)

Thanks. Another update. When local storage for smart previews and originals is disabled, I am able to edit the RAW photo successfully (EOS R5 CR3 file). However I am unable to render ANY of these files to JPG. See attachment. 

Received log and have forwarded to the team. 

Done. Can you let me know where to securely submit the diagnostic log?

I can confirm this issue occurs when either store smart previews locally, or store original files locally is checked. Both must be disabled for my lightroom to work and edit CR3 images from a Canon R5. All other images can be edited without issue. This only affects these images.

Let's do this.

1. Restart Lightroom
2. Get in the 'cant't edit state' 
3. Attempt a couple of edits
4. Create a diagnostic log for us to review

For LrDesktop

Go to Preferences

Account Section

Hold down the [Opt/Alt] key to make [Diagnostic Log] button appear.

Yes, and re-checking breaks it again. Maybe it has something to do w/ server-side vs client-side rendering of the CR3 RAW image. But, it's a bug.

I can edit the file regardless of how the option is set.  Since deleting the Cache have you attempted to recheck the box?

I made some progress in identifying the cause of this bug, which it is. It only occurs when "Store a copy of all smart previews locally" is checked. When I uncheck this box and delete the photo cache, CR3 files are rendered properly.