Find known issues and limitations in the latest release of Lightroom Classic.

macOS compatibility

Error when adding images to a collection

Issue Workaround

When adding images to a Collection in Lightroom Classic 10.0, you see the error, "?:0: attempt to compare two nil values"


Change the sort order of the target collection to something other than Custom

Only one collection visible in the Collections panel

Issue Workaround

If the Collections panel is collapsed while closing Lightroom Classic, only one collection is visible in the Collections panel after you launch Lightroom Classic again.


In the Collections panel, click + and select a different sort order from the one selected.

Unexpected Error opening catalog

Issue Workaround

When starting Lightroom Classic 10.0, you see the error, "Unexpected Error opening catalog. The catalog could not be opened due to an unexpected error."


Install the previous version of Lightroom Classic

See Revert to the previous Lightroom Classic version

Unable to export for Email

Issue Workaround

When exporting for email within Lightroom Classic, either nothing happens, or you see the error, "Internal error has occurred :?:0: attempt index field "font" (a nil value)".


1. Export locally, then attach manually to email

  1. Choose Export > For Email (Hard Drive)
  2. Choose a location to export your image
  3. Manually attach the exported image to an email using your preferred email client

2. Install the previous version of Lightroom Classic

See Revert to the previous Lightroom Classic version

Canon EOS R5 raw files are too bright

Issue Workaround

Canon EOS R5 CR3 files appear too bright.


To resolve this issue, do the following:
  1. For R5 image that appears brighter, adjust the exposure -2/3 stop.
    If you have a group of R5 images, select them and click the small left Exposure arrow twice in the Quick Develop panel. 
  2. In Lightroom Classic, choose Edit > Preferences > Performance (Windows) or Lightroom Classic > Preferences Performance (macOS) and click Purge Cache under the Camera Raw Cache Settings

Other issues

Issue Workaround

When you try to convert a .GPR file to DNG, you get the following message:

Non-raw files were not converted to DNG.

.GPR files are effectively DNGs and hence, cannot be converted to DNG.
If you create a preset with empty local adjustments (where the sliders have not been moved from zero) and use this preset on an image where the local adjustments exist, regardless of the selecting the adjustment box or not, it will overwrite the existing local adjustments to the image.
Step back in the History panel, remove the empty local adjustments, and update the preset.
(Enterprise accounts only) On updating to the latest version of Lightroom Classic, end users are prompted to sign in to use their app. Enterprise end users may see that their app is running in trial mode and may be prompted to start a trial or purchase a subscription if the app was deployed using enterprise serial numbers. This issue is expected to occur if the previous installation of Lightroom Classic CC (v7.x or earlier) was licensed and deployed by your admins using an enterprise serial number. For resolution and mitigation steps, see Lightroom Classic asks for sign-in on update.

(Mac only) If you are a Creative Cloud for Teams user in China, an error message is displayed every time you launch Lightroom Classic. The error is displayed even though you have installed the app on your computer in the language specified in the message.

To resolve this error, change your operating system's setting to set Simplified Chinese as the primary OS language and then launch Lightroom Classic. 

For related helpful information, see Error launching CC apps for Teams users in China.