Bug in batch processing (auto mode in Develop module)

[Diamantis23750061658e]

I'm running LRC 13.3.1 on a MBP M3. Just now (22 June 2024) I noticed this: I batched processed about 150 photos. While I was checking them one by one to see if they were OK, the changes were made (the sliders moved) but they were not visible, not even pressing / (before/after). Once I moved a slider (e.g.: white balance) then all the changes became visible. So I couldn't check the results of the auto processing unless I moved a slider, which needless to say, is annoying.

[John R Ellis]

Are these DNGs by any chance?

[Diamantis23750061658e]

No, they are raw (cr3) files. Still having the issue. Not always though and I haven't found out what triggers it.

[John R Ellis]

Over the years, LR has had a number of bugs applying Auto Settings to batches of photos, and Adobe has never been able to get it right. The most recent open bug report from 2022:

https://community.adobe.com/t5/lightroom-classic-bugs/p-syncing-develop-settings-to-a-large-batch-of...

Other recent reports of problems:

https://community.adobe.com/t5/lightroom-classic-discussions/import-preset-using-auto-tone-does-not-...

https://community.adobe.com/t5/lightroom-classic-discussions/lightroom-auto-settings-not-being-appli... 

After applying Auto, you might try selecting all the photos and doing Library > Previews > Build 1:1 Previews, which usually forces LR to re-render the images and save the rendering in its caches.