Lightroom Classic 14.5 fails to open

[mikej4252593]

I have recently updated to Lightroom Classic version 15.5 and am having problems opening the app on my M3 Pro MacBook Pro, running MacOS 15.6.  When I first try to start a session it either fails to open and I have to force quit and try again, or takes a very long time to open.  When I do eventually get it to open if I close it down and reopen it does so with no problem. I have tried uninstalling reinstalling the app, but this makes no difference. 

[DdeGannes]

There has been an update to LrC 14.5 to version 14.5.1 that has several bug fixes.

See the following.

• Classic: “Some masking models are downloading. Please try again later” (Copy/Paste Preset) (Mac) * fixed in 14.3.1 *
• Classic: Unable to move crop to image edges after negative (CCW) rotation * fixed in 14.3.1 *
• Classic: Transform [Update] button stops working after application of [Previous] * fixed in 14.3.1 *

[Srishti Bali]

Hi @mikej4252593

Sorry to hear you’re running into this issue after updating. Could you please share your system info (you can copy-paste it from Lightroom: Help > System Info) and let us know if you see any error messages when it fails to open?

I would also suggest trying the steps in this troubleshooting guide, which covers common crash or freeze issues: https://adobe.ly/3JCUDGq

Let us know how it goes!

Regards,

Srishti

[mikej4252593]

Hi Srishti

None of the steps in the troubleshooting guide seem appropriate as they all assume that Lightroom Classic is running, whereas my issue is getting it to open.

My system info is as follows. Hope this helps

Regards
Mike


Lightroom Classic version: 14.5 [ 202508061311-4cef2162 ]
License: Creative Cloud
Language setting: en-FR
Operating system: Mac OS 15
Version: 15.6.0 [24G84]
Application architecture: arm64
Logical processor count: 12
Processor speed: NA
SqLite Version: 3.36.0
Power Source: Plugged In, 87%
Built-in memory: 36 864,0 MB
Dedicated GPU memory used by Lightroom: 16 784,8MB / 27 648,0MB (60%)
Real memory available to Lightroom: 36 864,0 MB
Real memory used by Lightroom: 5 145,5 MB (13,9%)
Virtual memory used by Lightroom: 435 093,0 MB
Memory cache size: 860,4MB
Internal Camera Raw version: 17.5 [ 2318 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2
Camera Raw virtual memory: 1638MB / 18431MB (8%)
Camera Raw real memory: 1670MB / 36864MB (4%)

Cache1:
Final1- RAM:141,0MB, VRAM:0,0MB, Hong Kong-7.CR2
Final2- RAM:1 186,0MB, VRAM:9 758,0MB, Hong Kong-8.CR2
NT- RAM:1 327,0MB, VRAM:9 758,0MB, Combined:11 085,0MB

Cache2:
m:860,4MB, n:282,4MB

U-main: 153,0MB

Standard Preview Size: 3456 pixels
Displays: 1) 3456x2234

Graphics Processor Info:
Metal: Apple M3 Pro
Init State: GPU for Export supported by default
User Preference: Auto
Enable HDR in Library: ON
GPU for Preview Generation: Auto (S5_27)

Application folder: /Applications/Adobe Lightroom Classic
Library Path: /Volumes/Photographs/Mike_2025/Mike_2025.lrcat
Settings Folder: /Users/michaeljacobs/Library/Application Support/Adobe/Lightroom

Installed Plugins:
1) AdobeStock
2) Canon Print Studio Pro
3) Logi Plugin
4) ON1 Photo RAW 2025
5) Topaz Photo AI

Config.lua flags:

[mikej4252593]

Thanks.  I've updated to 14.5.1 and will see if that makes any difference.

[mikej4252593]

The update to 14.5.1 has not solved my problem.  Thus is so frustrating.  Every time I start a new session for that day Lightroom Classic refuses to open and I have to Force Quit the app.  Having done that, when I next click to open the app everything is fine.  This doesn't seem to make any sense.

[Rag and Bone]

Once LR is running, try disabling the plugins. I had some issues with the Logi plugin for a while.

Failing that, have you tried uninstalling, followed by a re-install?

[mikej4252593]

Yes, I thought about the plugins and have now disabled all, but I'll have to wait until tomorrow to see if that solves the problem because, as I said, once Lightroom Classic is running I can close and reopen with no problem.  It is only when I start a Lightroom session for the day that this happens.

I have tried uninstall and reinstall, but it didn't help.

[nikunj.m]

We're sorry that you continue to experience the same behavior. Try to reset the preferences of Lightroom using the steps mentioned here: https://adobe.ly/45VWZba

If the issue persists, try re-installing the application after removing it using the Creative Cloud Cleaner tool. You can check out the steps to use the Creative Cloud Cleaner tool here: https://adobe.ly/45DLVAn

Let us know how it goes! 
Thanks,
Nikunj

[mikej4252593]

All plugins disabled, but problem persists.

[mikej4252593]

It seems that Lightroom Classic does sometimes load if I leave it long enough, but it takes a very long time.

[nikunj.m]

Did you try reinstalling the app as suggested to check if that makes a difference? 

Thanks,
Nikunj

[mikej4252593]

I haven't yet tried the Creative Cloud Cleaner tool as it all looks rather complicated, especially using the Activity Monitor.

[AxelMatt]

@mikej4252593  The usage of the Cleaner Tool isn't much complicated. Follow the steps in the "How to use the Creative Cloud Cleaner tool" section of the linked document form @nikunj.m .

For usiing the Activity Monitor see here:

Quit an app or process in Activity Monitor on Mac - Apple Support (IN)