copy paste and/or sync does not work consistently with many files.

[Lorne Resnick]

Basically copy/paste (or sync) over large numbers of images works, well, inconstantly - at best. I am running desktop Lightroom Classic cc v 8.0

The entire issue is well described many places on the internet including here.

https://feedback.photoshop.com/photoshop_family/topics/applying-auto-tone-to-a-batch-of-photos-loses...

Basically, I can copy/paste (or auto sync) over 10-20 images - no issue. More than that, forget it, it just does not work.

It seems the sync only works if I can actually see the image in the single or thumbnails view.

I have...

-restarted Lightroom and the mac (High Sierra)

-trashed the prefs

-Synced and let it sit for days

-rebuilt the thumbnails.

I cannot do the copy paste 10 images at a time, as I have a folder with 10,000+ images I need to process.

I have been using Lightroom since inception and this "procedure" used to work perfectly before.

[John R Ellis]

Did you try the workaround listed in that bug report?  After copy/paste, sync, or applying the preset to the batch of photos, select them and do Library > Previews > Build Standard-Sized previews, and then wait for the progress bar to show the building of previews has completed.  Many people use that workaround, and I haven't seen previous reports of it not working.

[Lorne Resnick]

I should have indicated that I did build full size 1:1 previews and waited for the progress bar to finish. It did not work.

Do you think standard previews would make any difference? Let me try and I'll report back shortly.

[John R Ellis]

Do you think standard previews would make any difference? Let me try and I'll report back shortly.

I'd be very surprised if it makes a difference. When LR builds a preview of any size, it re-renders the photo from scratch, which is what works around the bug (at least for others).

[Lorne Resnick]

Nope didn't work.

I should add: That it's not just the how the images "looks" on the screen. If part of the setting that I am copy/pasting (or syncing) indicates that the exposure is, let's say 0.15. a few hundred of the images will correctly show their exposure at 0.15 (and look correct )- the remaining balance are untouched in terms of the actually numerical setting and the preview look.

If I copy/paste (sync) one (or 20) image(s) at a time it works perfectly.

I'm trying to affect thousands of images, so 20 at a time is a non-starter.

[Lorne Resnick · Accepted solution]

So. I spent about 90-minutes on the phone with tech help at Adobe. And I feel like I may have connected with one of the few tech people that actually know what they are talking about.

She seems to have solved the issue and it's something that I would have NEVER tried.

So, maybe this will help others with similar unresolved issues.

Here's what 100% fixed it:

1. Go to Lightroom>preferences

2. Click on the performance tab

3. UNCLICK "Use Graphics Processor".

She explained why this could work, but I think I blacked out halfway through the explanation.

Anyway. It worked.

She also suggested I reduce my cache form the 200GB it was at to the 10GB it is at now. That did not work. Just thought I'd mention that.

[John R Ellis]

3. UNCLICK "Use Graphics Processor".

Let us know if this continues to solve your problem. It's pretty strange -- the option controls how LR displays images on the screen, and unchecking it often fixes display problems. But it's hard to see how it would control whether copy/paste successfully changes a Develop slider setting.  But bugs can have strange consequences...

[DdeGannes]

Quote "Let us know if this continues to solve your problem. It's pretty strange -- the option controls how LR displays images on the screen, and unchecking it often fixes display problems. But it's hard to see how it would control whether copy/paste successfully changes a Develop slider setting.  But bugs can have strange consequences"...

The Graphics Processor only offers any help if you are utilising a 4K monitor or higher. No need to have it selected otherwise.

[John R Ellis]

She also suggested I reduce my cache form the 200GB it was at to the 10GB it is at now.

Independent of your current problem, reducing the cache size to 10 GB is a good thing -- 200 GB was just wasting space. In early versions of LR, huge caches could help, but that changed a long time ago, and 10 GB is sufficient: https://www.lightroomqueen.com/lightroom-performance-debunking-myths/

[Lorne Resnick]

Thanks!

Yes. It seems to have fixed it. The way she explained it was some sort of conflict bug. As you said: strange consequences...