P: LrC 15.6: Sliders bouncing in the Develop module

Same here. It just broke startiong today. Sliding any of the sliders jumps over to the edge. This is incredibly annoying and making Lightroom unusable.

It only affects sliders. Other dragging (cropping, tone curve) works fine.

What doesn’t fix it:

Turning off GPU
Restaring Lightroom
Restarting the computer
Resetting preferences

Macos Tahoe 26.3

Same issue whit the sliders  Help!!!!

I’m having the same problem. Worked fine a few days ago, now when I loaded new photos the sliders jump all the way to the left. Very frustrating! What’s going on?

I’m having the same problem with LR 15.6 and Mac  with Apple M2 Pro. It worked fine last week, now suddenly the sliders are going to the far left edge when I try to maneuver them. Sometimes they won’t work at all but remain stuck on the left side. 

I’m having the same issue, it was working ok yesterday and today the slider jumps to the far left as soon as I click it.

This exact problem is being investigated as a bug. 

After updating Lightroom Classic to version 15.6, all Develop module sliders jump to incorrect values when I click and drag them.

For example, when I try to increase Exposure to approximately +1.00, the slider immediately jumps to a completely incorrect value, sometimes around -4 or another unexpected position.

The same problem occurs with Exposure, Contrast, Highlights, Shadows and other Develop sliders.

Directly typing the numerical value into the field works correctly. The problem occurs specifically when dragging the slider with the mouse.

I tested a different mouse and the problem remained.

I reset Lightroom Classic Preferences and the problem remained.

I also tested a completely new Lightroom Classic catalog and the problem still occurs.

I also tested with GPU display acceleration disabled, but the problem remained.

The problem started after updating to Lightroom Classic 15.6. Before the update, the sliders worked normally.

System:

Mac with Apple M2 Pro

Lightroom Classic 15.6

macOS

Please investigate this as a possible slider interaction bug in Lightroom Classic 15.6.

Thread locked by moderator. Further discussions only in the existing bug report:

Also having this issue…  Once i click a slider and move it even the slightest amount, it jumps alllll the way to the left. 

Sliders are jumping in the develop module!  Once i click a slider and move it even the slightest amount, it jumps alllll the way to the left. 

Is this, perhaps, a Mac issue - looks like all the system-info dumps are Mac OS26?

Here’s Mine:

 

Lightroom Classic version: 15.6 [ 202609251514-f839cde9 ]
License: Creative Cloud
Language setting: en-GB
Operating system: Mac OS 26
Version: 26.0.0 [25A354]
Application architecture: arm64
Logical processor count: 10
Processor speed: NA
SqLite Version: 3.45.1
Adobe GSDK Version: 1.4.0.213

Built-in memory: 16,384.0 MB
Dedicated GPU memory used by Lightroom: 1,786.9MB / 12,124.1MB (14%)
Real memory available to Lightroom: 16,384.0 MB
Real memory used by Lightroom: 1,580.2 MB (9.6%)
Virtual memory used by Lightroom: 437,435.6 MB
Memory cache size: 338.0MB
Internal Camera Raw version: 18.7 [ 2743 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2
Camera Raw virtual memory: 1278MB / 8191MB (15%)
Camera Raw real memory: 1300MB / 16384MB (7%)

Cache1: 
Final1- RAM:378.0MB, VRAM:0.0MB, Oct-02-2026-DSC_2303-07-39.NEF
NT- RAM:378.0MB, VRAM:0.0MB, Combined:378.0MB

Cache2: 
m:338.0MB, n:352.1MB

U-main: 127.0MB

Standard Preview Size: 2560 pixels
Displays: 1) 2560x1440

Graphics Processor Info: 
Metal: Apple M2 Pro
Init State: GPU for Export supported by default
User Preference: Auto
Enable HDR in Library: OFF
GPU for Preview Generation: Auto (S5_11)

Application folder: /Applications/Adobe Lightroom Classic
Library Path: /Volumes/Mies/photo-archive/full-catalogue/100realpeople-v13-3.lrcat
Settings Folder: /Users/richardpartridge/Library/Application Support/Adobe/Lightroom

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

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