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daniellei4510
Community Expert
daniellei4510Community Expert
Community Expert
October 10, 2026
Open for Voting

P: LrC 15.6 Preview does not render for images with specific Content Credentials

Lightroom previews won’t stop “Loading.” And these are minimal-size previews, which I created when this problem started with 1:1 previews after I removed all the files from Lightroom and re-imported them. And, when I attempt to build 1:1 previews, even if I only select one, the progress bar doesn’t move at all or gets stuck. This issue just started up a day or two ago.

 

    Pinned Reply By Sameer K

    Hey all! Thanks for bringing this up, and special kudos to @johnrellis for helping speed this up, and supplying speicfic steps and details.

    I can recreate this consistently, and have shared this with the team for review.


    Thanks!
    Sameer K
    (Type '@' and type my name to mention me when you reply)

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    28 replies

    Sameer K
    Community Manager
    Sameer KCommunity ManagerPinned
    Community Manager
    October 14, 2026

    Hey all! Thanks for bringing this up, and special kudos to @johnrellis for helping speed this up, and supplying speicfic steps and details.

    I can recreate this consistently, and have shared this with the team for review.


    Thanks!
    Sameer K
    (Type '@' and type my name to mention me when you reply)

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      daniellei4510
      Community Expert
      daniellei4510Community ExpertAuthor
      Community Expert
      October 14, 2026

      A special thanks indeed to @johnrellis for helping me figure out why this was happening. And to others for their suggestions as well, all of which were attempted but to no avail. So it was indeed a frustrating 24-hour period!

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      Adobe Community Expert | I have miles to go before I sleep, but I'm all done on this end.
      johnrellis
      johnrellis
      Legend
      October 13, 2026

      Moderators, ​@Sameer K, please move to Bugs. See my previous reply for a bug recipe.

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      johnrellis
      johnrellis
      Legend
      October 13, 2026

      [View this post in your web browser. It contains formatting and images that don't appear in email.]

       

      LR stalls trying to build Library previews for JPEGs created by Nano Banana, apparently stumbling over the content credentials embedded in the JPEGs. To reproduce in LR 15.6 / Mac OS 26.6.2:

       

      1.  Download and unzip the attached tiny catalog.

       

      2. Open the catalog.

       

      3. Select the photo “no-jumbf.jpg” and do Library > Previews > Build Standard-Sized Previews. Observe that it completes correctly.

       

      4. Select the photo “Generated Image October 12, 2026 - 11_11PM.jpg” and do Build Standard-Sized Previews. Observe that it never completes:

       

      The photo “no-jumbf.jpg” is a copy of “Generated Image October 12, 2026 - 11_11PM.jpg” with the JUMBF metadata section (containing the content credentials) removed using Exiftool:

      exiftool -jumbf:all= no-jumbf.jpg

       

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      daniellei4510
      Community Expert
      daniellei4510Community ExpertAuthor
      Community Expert
      October 13, 2026

      Very interesting. At least it wasn’t my imagination. Or my computer. Even without the preview, it opens fine in Photoshop. Thanks for this!

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      Adobe Community Expert | I have miles to go before I sleep, but I'm all done on this end.
      johnrellis
      johnrellis
      Legend
      October 13, 2026

      If you have one of the Nano Banana files creating the problem, please attach it here. If we can reproduce the problem, then it’s more likely Adobe will fix it.

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      daniellei4510
      Community Expert
      daniellei4510Community ExpertAuthor
      Community Expert
      October 13, 2026

      I deleted them, but I’ll check my history on NB 2.1 to see if they are still available.

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      Adobe Community Expert | I have miles to go before I sleep, but I'm all done on this end.
      daniellei4510
      Community Expert
      daniellei4510Community ExpertAuthor
      Community Expert
      October 13, 2026

      Well this is going to sound weird, but I think I found the problem. The issue began after I imported some files created with the new Nano Banana 2.1, which I finally realized were the only files that were having trouble creating previews. So I imported them into Photoshop, copied and pasted them into a new Photoshop window, resaved them with updated file names, and imported them back into Lightroom. Then I deleted the original files. Now Lightroom (at least for the last couple of hours) has been running at a reasonable 4% or 5% CPU usage. Go figure.

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      Adobe Community Expert | I have miles to go before I sleep, but I'm all done on this end.
      davidmaizil
      Participating Frequently
      October 12, 2026

      Your System Info shows "GPU for Preview Generation: Auto". Since Develop looks fine and only the Library previews fail, try setting Preferences > Performance > Use GPU for Preview Generation to Off, restart Lightroom Classic, and rebuild previews for a few of the bad photos.

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        daniellei4510
        Community Expert
        daniellei4510Community ExpertAuthor
        Community Expert
        October 12, 2026

        Thanks, I’ll give that a shot!

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        Adobe Community Expert | I have miles to go before I sleep, but I'm all done on this end.
        dj_paige
        dj_paige
        Legend
        October 12, 2026

        Please clarify your post. Are you using Lightroom (Lr icon) or Lightroom Classic (LrC icon)? Where does this problem appear: Library Module, Develop Module, somewhere else?

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        davidmaizil
        Participating Frequently
        October 12, 2026

        This sounds like a damaged preview cache. It survives removing and re-importing the photos because it lives in its own file next to the catalog, not in the catalog itself.

        Quit Lightroom Classic. In the folder that holds your catalog (the .lrcat file) there is an item called "<your catalog name> Previews.lrdata". Rename it to something like "Previews-old.lrdata". Start Lightroom again: it creates a fresh, empty preview cache. Previews rebuild as you browse, or select the photos and use Library > Previews > Build Standard-Sized Previews.

        If that fixes it, delete the old one. If it doesn't, check the free space on the drive that holds the catalog, since preview building stalls when that drive is nearly full.

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        daniellei4510
        Community Expert
        daniellei4510Community ExpertAuthor
        Community Expert
        October 12, 2026

        Yep, I tried deleting the lrcat file. No go. The drive where I save the Lightroom files has over 1 TB of space available. 

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        Adobe Community Expert | I have miles to go before I sleep, but I'm all done on this end.
        Community Expert
        AxelMattCommunity Expert
        Community Expert
        October 12, 2026

        ​@daniellei4510 wrote: Yep, I tried deleting the lrcat file…

        Do you have really delete the .lrcat file? This is your Lightroom catalog.Try to restore the catalog from the trash or from the latest backup.

        Then do what ​@davidmaizil wrote: rename or delete the folder <your catalog name> Previews.lrdata". Lightroom restore the preview cache automatically.

          

         

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        My System: Intel i7-8700K - 64GB RAM - NVidia Geforce RTX 3060 - Windows 11 Pro 26H2 -- LR-Classic 15 - Photoshop 27 - Nik Collection 9 - PureRAW 6 - Topaz Photo AI
        dj_paige
        dj_paige
        Legend
        October 11, 2026

        Please be more specific. Are you talking about Lightroom (Lr icon) or Lightroom Classic (LrC icon)? Does this happen in the Library Module or the Develop Module or the Import dialog box or somewhere else?

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        dj_paige
        dj_paige
        Legend
        October 11, 2026

        Please be more specific. Are you talking about Lightroom (Lr icon) or Lightroom Classic (LrC icon)? Are you having this problem in the Library Module or the Develop Module or the Import dialog box, or somewhere else?

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        daniellei4510
        Community Expert
        daniellei4510Community ExpertAuthor
        Community Expert
        October 12, 2026

        Sorry. Lightroom Classic. It happens in the Library Module. Assets look fine in the Develop Module, but when I return to the Library Module, the assets is still low-res or “Loading.” Even after “successfully” building a 1:1 preview, the asset still looks low-res. It doesn’t happen ALL assets, but most, and assets imported weeks, months, or even years ago work fine. 

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        Adobe Community Expert | I have miles to go before I sleep, but I'm all done on this end.
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