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P: LrC 15.6: Sliders bouncing in the Develop module

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Lightroom was working perfectly this morning.. I come to load in new images and edit some while sitting here.. and as soon as Lightroom opened up - I tried to slide exposure (and other ones to test those...) and the slider immediately jumps one way or another.

I have reset preferences, turned off GPU.. NOTHING is helping.. please help me!

Pinned Reply By Sameer K

Hi All! Note from the team:

“On macOS Tahoe 26.3 or earlier, if the Develop module sliders move erratically after upgrading to Lightroom Classic 15.6, update to the latest Tahoe version (26.7, or later).”

Thanks!
Sameer K

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Nicklas26303304arow

Participant

Had the same issue. Just had to go back to 15.1 and it works now for me.

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CO34177782qfd9

Participant

This is happening to me as well after the v15.6 update.

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dj_paige

Legend

@CO34177782qfd9 Please provide the information requested. Also, try a different mouse, as stated earlier in this thread.

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dj_paige

Legend

There have been other reports of sliders not staying where you put them, and it immediately moves to somewhere else. I haven’t read of any solutions.

As a wild guess, if your mouse is wireless, try a wired mouse.

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stephanieh54345612Author

Participant

I am hoping this just happened with a recent update and that Lightroom will fix it!! I edit on my laptop - so I use a trackpad. I tested the same motion on other things on my computer and it works perfectly everywhere except Lightroom….

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dj_paige

Legend

Can you temporarily use a wired mouse (or even a wireless mouse) with your laptop (instead of the track pad) to see if the problem goes away?

Are you talking about Lightroom (Lr icon) or Lightroom Classic (LrC icon)?

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Sameer K

Community Manager

Hey, @stephanieh54345612. Welcome to the Lightroom Classic Community. I'll need more information about your workflow to help you. Please share the system info from Lightroom Help > System info > Copy & paste into a text document > upload & attach here.

Where do you keep the Lightroom Catalog and RAW files? Internal, or external drive?

Please share more details, such as screenshots or a video showcasing the error/behavior.

Awaiting hearing from you. Thanks!

Sameer K

(Type '@' and type my name to mention me when you reply)

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stephanieh54345612Author

Participant

@Sameer K Thank you.

Lightroom Classic version: 15.6 [ 202609251514-f839cde9 ]
License: Creative Cloud
Language setting: en-US
Operating system: Mac OS 26
Version: 26.3.1 [25D2128]
Application architecture: arm64
Logical processor count: 12
Processor speed: NA
SqLite Version: 3.45.1
Adobe GSDK Version: 1.4.0.213

Power Source: Plugged In, 100%
Built-in memory: 32,768.0 MB
Dedicated GPU memory used by Lightroom: 3,329.4MB / 25,559.0MB (13%)
Real memory available to Lightroom: 32,768.0 MB
Real memory used by Lightroom: 8,862.8 MB (27.0%)
Virtual memory used by Lightroom: 435,123.3 MB
Memory cache size: 10.6MB
Internal Camera Raw version: 18.7 [ 2743 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2
Camera Raw virtual memory: 381MB / 16383MB (2%)
Camera Raw real memory: 383MB / 32768MB (1%)

Cache1:
Final1- RAM:365.0MB, VRAM:2,572.0MB, 144A5235.CR3
NT- RAM:365.0MB, VRAM:2,572.0MB, Combined:2,937.0MB

Cache2:
m:10.6MB, n:352.3MB

U-main: 139.0MB

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

Graphics Processor Info:
Metal: Apple M2 Max
Init State: GPU for Export supported by default
User Preference: Auto
Enable HDR in Library: ON
GPU for Preview Generation: Auto (S5_24)

Application folder: /Applications/Adobe Lightroom Classic
Library Path: /Users/steph/Pictures/Lightroom/Backups/2026-09-30 2058/Lightroom Catalog-v13-3/Lightroom Catalog-v13-3.lrcat
Settings Folder: /Users/steph/Library/Application Support/Adobe/Lightroom

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

Config.lua flags:

Internal.

I edit on my laptop - so I use a trackpad. I tested the same motion on other things on my computer and it works perfectly everywhere except Lightroom….

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FoveaCreative

Inspiring

There’s a serious bug in this release! After updating last night, in Develop module the slider controls are broken. The cursor doesn’t stick to the slider control point and the control point flips itself to the far left end on its own. The preview does not update after making adjustment in Develop module, but the adjustment is visible in Navigator and Library module.

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