Lightroom Classic 12.3 freezes on MacOS 12.6.5 when exporting

[Mark29943800ahv0]

I have updated to the latest version of MacOS Monterey and the latest version of Lightroom Classic. I can import, tag, process photos in my library fine. However, when I try to export files from the Quick Collection I have issues. I choose to export format JPEG. I can change quality settings, sharpening etc, but when I choose to resize by Long Edge as soon as I click in the box to change the number of pixels I get the spinning wheel and the app no longer responds and has to be Force Quit. This happens whether GPU is enabled in performance or not.

[Ian Lyons]

Please provide post a copy of your 'System Info'. You can obtain same from the LrC Help > System Info menu item as shown in attached screenshot.

[Mark29943800ahv0]

Lightroom Classic version: 12.3 [ 202304101834-a085245c ]
License: Creative Cloud
Language setting: en-AU
Operating system: Mac OS 12
Version: 12.6.5 [21G531]
Application architecture: arm64
Logical processor count: 8
Processor speed: NA
SqLite Version: 3.36.0
Built-in memory: 16,384.0 MB
Real memory available to Lightroom: 16,384.0 MB
Real memory used by Lightroom: 907.3 MB (5.5%)
Virtual memory used by Lightroom: 403,249.0 MB
Memory cache size: 15.9MB
Internal Camera Raw version: 15.3 [ 1451 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2
Camera Raw virtual memory: 234MB / 8191MB (2%)
Camera Raw real memory: 237MB / 16384MB (1%)
Standard Preview Size: 2048 pixels
Displays: 1) 2560x1440, 2) 2560x1440

Graphics Processor Info:
Metal: Apple M1
Init State: GPU for Export supported by default
User Preference: Off

Application folder: /Applications/Adobe Lightroom Classic
Library Path: /Users/<redacted>/Lightroom/Our Photos/Our Photos-v12.lrcat
Settings Folder: /Users/<redacted>/Library/Application Support/Adobe/Lightroom

Installed Plugins:
1) AdobeStock
2) Aperture/iPhoto Importer Plug-in
3) Flickr
4) Nikon Tether Plugin

Config.lua flags: None

[Mark29943800ahv0]

Updated to version 12.4 today, same issue still exists. Unable to export.

[Mark29943800ahv0]

On version 12.4, and after reading some other post with issues, I set the GPU usage on the M1 to custom and unchecked the use of GPU on export. No issues. Re-enabled afterwards and it seem to be ok.

I did note that when export use was enabled previously the dialog stated something about partial use of the GPU but after disabling and re-enabling it now says full use.

[Ian Lyons]

ACR, LrC and LrD all carry out a test on the GPU each time they're launched. This test establishes what features the GPU supports. On an M1 or M2 based Mac with 16GB of memory or more the test should normally return a 'Pass' for  'Full Acceleration' when the GPU preference is set to 'Auto'. 

Note that the 'System Info' you submitted  in May indicated that the GPU supported 'Export', but had been disabled by the user, not as a result of the GPU test.