LrM sync issue error - "Code: T20200121; Message: xmp develop sha256 mismatch"

[umlautnord]

Hi - 
 
I have run into some unexpected LrM/LrD sync trouble after the recent updates, leading to the below error. I was making some edits on LrM (iPadOS) to Smart Previews synced up from LrC. Everything seemed to generally be going fine. Changes synced across as expected, though some images weren’t always properly changing albums in LrM when moved in LrC. At one point, I switched back to Edit in LrM for a couple of those images. I'd changed Edit settings on them a few minutes prior. I received a "Settings could not be loaded" error. "Error Code: T20200121; Message: xmp develop sha256 mismatch." Screenshot below. Issue was originally for 2, but now 3, images.

iPad LrM shows sync progress for 3 images, but is moving insanely slowly—after 3 hours it is at 98%, and has been there for maybe an hour. Internet connection is fine. Some other images and album/collection membership do currently sync fine between LrC, the cloud, and LrM—it’s not a totally broken connection.

I could try to wait to see if the iPad sync % someday hits 100% and fixes the issue there, but it seems more systemic. As noted, a third image joined the original two, while I was troubleshooting, and troublingly, there aren’t just issues with the iPad.

I’m also seeing the exact same album membership issues for the same problem images when I open/sync LrD (or LrM on an iPhone). I don’t yet see the Settings error on those platforms for the problem images at this point, but haven't tried to make any settings changes there. I haven't used LrD much/at all with these images. Given the same album membership issues are present despite that, I suspect I'd eventually run into the same problem.

Interestingly, LrW is matching/syncing with LrC completely as expected in terms of album/collection membership, develop/edit settings, and metadata. LrW is not throwing the Settings error in Edit for the problem images, or indicating any sync errors overall. LrC is not stuck on any sync and is not indicating any issues. The problem seems to be between whatever powers LrW ("the cloud?") and LrD/LrM on my devices.

Common denominators on the images: They're are all HEICs locally in LrC, but it’s a small enough sample size that I don’t know if it’s relevant. (I'm also working with DNGs in the same group of ~15.) They all also have some sort of AI usage/application. The first two have generative AI removals; the third one has AI object detection based masks (all AI-based masks/remvals were originally created in LrC).

I'm happy to interface directly with someone at Adobe with asset IDs and such if helpful to trace the problem/error. I'm extremely concerned the issue might continue to grow, especially given that it's not just the iPad acting abnormally.

Thanks.

----

System:

• I have my collection/library in LrC (v13.3) on Sonoma 14.5 on a 13" MBP M1 2020.
• I was editing smart previews synced into the cloud on LrM v9.3.0 on iPadOS v17.5.1 on an 11" iPad Pro (2nd gen).
• LrD on the MBP, in which I see the same album membership issues as the other products, is v7.3.

[umlautnord]

Moving this with Adobe support directly, but if anyone has seen similar (essentially, Lr Web and LrD/LrM getting out of sync; Classic in the mix; completely starting with a fresh install of LrD/LrM removed the settings errors but did not totally fix the overall issue), would welcome any insight. 

[davidwagoner]

I am getting the same error on random images. All the images have AI generated edits and blur. iPad IOS 17.5.1 Lightroom Mobile 9.3.0

[umlautnord]

Urgh. Frustrating. @davidwagoner , are you seeing the same behavior where LrWeb and LrClassic are fine/in sync/no errors, but it's just LrM where the error/problems are? And are they any specific file type—DNG/HEIC/JPG?

FWIW, resetting LrM entirely by deleting LrM on the iPad/reinstalling/completely re-syncing the full library reset the image back to whatever was in LrW/LrC and removed the error. Obnoxious and time consuming but effective as long as you didn't have a ton of edits waiting to upload out of LrM. However, my album membership sync issues remained for the images (they didn't get removed from albums they were not in in LrW/LrC), so there's still something going on.

Re AI—I recall in LrC v13.2, there were sync issues with images that used AI-based masks/removal/etc. But, those were between LrC and the cloud. It'd just get stuck waiting for settings in LrWeb/LrM/etc, and never finish syncing in LrC. You could fix it by removing any pre-v13.2 masks/edits and re-creating them in v13.2. This time, some of these images only had v13.3 AI edits. Removing all of them on one image did not fix the album membership issues between LrC/LrW<>LrM/LrD, so there's still something else going on. Maybe it's triggered by the AI stuff, maybe not. I'm not going to test further until Adobe Support digs in more. As much as I want to keep trying to figure it out myself...

[ianw69363354]

Same issue, I have to use Lightroom for work and I render about 200 to 300 photos every day this is absolutely killing me, I ran into the same issue on my friends iPad so I know its not just my hardware this needs to be fixed ASAP

[sprinklr-integration-user]

Hi umlautnord. Sorry for the trouble. 

Please try the Lightroom Web app at https://adobe.ly/3VJVnfr and check if you can access this site. It works for anyone who has subscribed to Lightroom Mobile. 

Thanks! 

Shivani 

[umlautnord]

Hi @sprinklr-integration-user - Lightroom Web was fine, had no sync errors or errors in Edit/Develop for the images, and was and in sync with Lightroom Classic in terms of develop settings and album/collection photo membership. Lightroom Mobile and Desktop were somehow out of sync with Lightroom Web—the error was in those applications while Web was fine. 

I have since just completely removed the problem images (and in some cases albums/collections) from the cloud one by one and re-added/reconstructed the albums/collections. That was doable because it was just a few images. Thankfully, I have not seen this specific error crop up again. But it was between Web and Mobile/Desktop.

[greule]

@ianw69363354 do you see the same issue with our recent update to version 9.4? just asking since we added some improvements in this respect. - Guido/ Lr iOS QE

[STEVE MACHIN]

I've started to experience this only a couple of months ago but it is becoming more and more frequent and incredibly frustrating in LrM, having to try and remember to save a version every single time I edit a photo or else when I return to it, it loses all adjustments and errors with this T20200121 Error - xmp develop sha256 mismatch. Using iPhone 15 Pro Max with 17.5.1 iOS, any help would be gratefully received. TIA.

[johanm11864634]

I'm experiencing the same: after editing some photo's (uploaded from DSLR), browsing to other photo's and opening the edited one again, I get the T20200121 error. On my Windows device, Lightroom shows that "This photo is missing settings from iPhone on ... that still needs to be synced." This doesn't happen to all photo's in the same album, nor is it linked to certain settings that are being used (masks, AI, ...). It appears to be "random".

Any help from Adobe Support would be great, since this is blocking me from properly editing my album!

[Gale Azure]

Also getting same error when editing the photos, hope that get fixed soon