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I have been going through old photos and when the previews are generated some of them are corrupted with banding and blocks of colors. It does not happen on my new files. The old files are from Canon 7D Mark II. I assume it is some kind of hardware like memory or hard drives. I am using external hard drives and copied the files from an older drive to a newer drive and it still happened.
Windows 10
16Gb memory
Lightroom Classic version: 10.1.1 [ 202101041610-8c69aa4e ]
License: Creative Cloud
Language setting: en
Operating system: Windows 10 - Business Edition
Version: 10.0.19042
Application architecture: x64
System architecture: x64
Logical processor count: 8
Processor speed: 3.4 GHz
SqLite Version: 3.30.1
Built-in memory: 16286.7 MB
Real memory available to Lightroom: 16286.7 MB
Real memory used by Lightroom: 2063.6 MB (12.6%)
Virtual memory used by Lightroom: 11314.0 MB
GDI objects count: 975
USER objects count: 2359
Process handles count: 3156
Memory cache size: 1135.0MB
Internal Camera Raw version: 13.1 [ 658 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 835MB / 8143MB (10%)
Camera Raw real memory: 836MB / 16286MB (5%)
System DPI setting: 96 DPI
Desktop composition enabled: Yes
Displays: 1) 1440x900, 2) 1920x1080
Input types: Multitouch: No, Integrated touch: No, Integrated pen: No, External touch: No, External pen: No, Keyboard: No
Graphics Processor Info:
DirectX: NVIDIA GeForce GTX 750 Ti (27.21.14.5638)
Application folder: C:\Program Files\Adobe\Adobe Lightroom Classic
Library Path: C:\Users\Owner\Pictures\H Drive Catalog\H Drive Catalog-2-2-v10.lrcat
Settings Folder: C:\Users\Owner\AppData\Roaming\Adobe\Lightroom
Installed Plugins:
1) AdobeStock
2) Athentech Perfect Exposure
3) Athentech Perfect Eyes
4) Athentech Perfectly Clear v2
5) Aurora HDR 2019
6) DENOISE projects standard
7) DxO PhotoLab 2
8) DxO PhotoLab 2 Importer
9) Facebook
10) Flickr
11) HDR Efex Pro 2
12) Helicon Focus Export
13) jf Flickr
14) jf Twitter
15) Lightroom to Exposure
16) Luminar 4
17) Luminar 2018
18) Luminar Flex
19) Nikon Tether Plugin
20) ON1 Photo RAW 2018
21) ON1 Resize 2018
22) Perfectly Clear Complete v3
23) PicDrop FTP Upload
24) SHARPEN projects
Config.lua flags: None
Adapter #1: Vendor : 10de
Device : 1380
Subsystem : 105f10de
Revision : a2
Video Memory : 2007
Adapter #2: Vendor : 8086
Device : 1912
Subsystem : 72a1028
Revision : 6
Video Memory : 80
Adapter #3: Vendor : 1414
Device : 8c
Subsystem : 0
Revision : 0
Video Memory : 0
AudioDeviceIOBlockSize: 1024
AudioDeviceName: Speakers / Headphones (Realtek Audio)
AudioDeviceNumberOfChannels: 2
AudioDeviceSampleRate: 48000
Build: LR5x64
Direct2DEnabled: false
Any ideas?
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This is almost always a hardware error, the hard drive is the first suspect. But it could be memory as well.
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Do you see a difference whether GPU support is on or off (set in preferences/performance)?