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Kirrrrrri
Participating Frequently
October 15, 2025
Question

Lightroom freezes when toggling “before/after” view with Subject Mask active

  • October 15, 2025
  • 1 reply
  • 330 views

When working with multiple masks in Lightroom, the app consistently freezes when toggling the “before/after” view (using either the “Eye” icon or the “\” keyboard shortcut) while the top mask is a Subject Mask.

 

Steps to reproduce:

  1. Create two masks on an image.
  2. Make the top mask a Subject Mask.
  3. Apply any mask adjustments.
  4. Repeatedly toggle the “Eye” icon or press “\” multiple times to view before/after.
  5. Lightroom will eventually freeze and become unresponsive.

 

System info:

macOS Sequoia (reproduced on multiple devices)

Lightroom Classic 14.5.1

 

Screen recording demonstrating the issue is attached.

Note: In the video, I’m clicking pretty fast just to trigger the freeze reliably, but in normal use Lightroom can still hang after just a few before/after checks.

1 reply

A
Community Manager
AlekeCommunity Manager
Community Manager
October 15, 2025

Hi @Kirrrrrri, welcome to the community!
I tried testing on my end but wasn’t able to reproduce the issue. One thing that might help is resetting your Lightroom Classic preferences, as that can often clear up odd glitches. Here’s how you can do that: https://adobe.ly/43d09GK

If that doesn’t do the trick, could you share your System Info with us? You’ll find it in Lightroom Classic under Help > System Info. Just copy it into a text file and attach it to your reply, or feel free to share it through Google Drive, WeTransfer, or any other file-sharing service you prefer.
Thanks so much, and we’ll do our best to help get this sorted!
Alek

*(If you mention me with an @, like @Aleke, I’ll get a notification and can respond faster.)*
K
KirrrrrriAuthor
Participating Frequently
October 15, 2025

Hi @Aleke! Thanks for the quick reply. I’ve attached my system info to this message.

I’ve already tried resetting Lightroom by removing preferences, but that didn’t resolve the issue.

I also tested it on several devices, including one with a fresh Lightroom installation (Lightroom was never installed on it before), and got the same result.

The issue is consistent in Lightroom Classic 14.5.1. In version 14.3.1 it’s less severe - the app occasionally freezes but unfreezes after a few seconds, whereas in the latest version, it stays frozen indefinitely.

Sameer K
Community Manager
Sameer KCommunity Manager
Community Manager
October 17, 2025

Hey, @defaulta7rtyzl08ukc. Thanks for the details. We're unable to reproduce this with a few masks. Could share the number of masks, maybe share a sample full-size DNG with masks and a video of what you see. 

 

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

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