P: LrC 15.6: Sliders bouncing in the Develop module

This is happening to me as well. I’m editing on a MacBook Pro. The sliders will automatically got to the extreme on either side depending on if you click left or right. I’ve tried with the wireless trackpad, the trackpad being wired, and the trackpad on the actual MacBook. I’ve also tried with catalogs on an external SD and a catalog on my computer’s internal storage. The error started happening after the update to 15.6. 

System Info: 

Lightroom Classic version: 15.6 [ 202609251514-f839cde9 ]
License: Creative Cloud
Language setting: en-US
Operating system: Mac OS 26
Version: 26.3.0 [25D125]
Application architecture: arm64
Logical processor count: 10
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: 3,790.0MB / 25,559.0MB (14%)
Real memory available to Lightroom: 32,768.0 MB
Real memory used by Lightroom: 3,423.6 MB (10.4%)
Virtual memory used by Lightroom: 428,185.5 MB
Memory cache size: 4.6MB
Internal Camera Raw version: 18.7 [ 2743 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2
Camera Raw virtual memory: 356MB / 16383MB (2%)
Camera Raw real memory: 440MB / 32768MB (1%)

Cache1: 
Final1- RAM:352.0MB, VRAM:2,972.0MB, untitled033.RAF
NT- RAM:352.0MB, VRAM:2,972.0MB, Combined:3,324.0MB

Cache2: 
m:4.6MB, n:317.5MB

U-main: 105.0MB

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

Graphics Processor Info: 
Metal: Apple M1 Max
Init State: GPU for Export supported by default
User Preference: Auto
Enable HDR in Library: OFF
GPU for Preview Generation: Auto (S5_24)

Application folder: /Applications/Adobe Lightroom Classic
Library Path: /Volumes/T7/PROJECT DIRECTORY/2026/005-PLACES/093026-New York, NY/CATALOG/093026-New York, NY/093026-New York, NY.lrcat
Settings Folder: /Users/davidsmith/Library/Application Support/Adobe/Lightroom

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

Config.lua flags: 

Just to add a data point.  I am using 15.6 on Win11.  Sliders work fine with Wacom tablet and Logitech mouse (Unifying USB connector).  

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

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

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.

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)