Lightroom Classic: Synchronise folder creates duplicates when non-Latin letters are used

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I have a problem - with folders containing Polish letters... I did "synchronize" on main folder, as I copied a bunch of folders with pictures from another disc into, and suddenly pictures I had in the catalog for years showed up again. And if I look into the library, the same picture is displayed, say, 5 times. If I select four of the thumbnails and tell Lightroom to remove the pictures from the catalog, all 5 are gone (even the one I haven't selected) - so it is not a problem of duplicated files, but a corrupted catalog. Of course I've checked the folder in Explorer and the files are not duplicated. Seems that Lightroom has a problem with non-Latin characters... Other users report the same issue with German, Greek etc.
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Rafal Przondo

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Posted 2 months ago

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Mayuri Jain, Employee

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Hi Rafal,

I tried to replicate the issue by following below steps:-
1. Create a parent folder containing Polish letters.
2. Copy folder with pictures in the parent folder and rename these subfolders such that it contains Polish letters.
3. Synchronize the main folder in the catalog.

No duplicate images are displayed. Also remove image from catalog is also working fine.

Could you please provide steps to replicate the issue? Also please provide system info.

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Rafal Przondo

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Hello, I've checked it again and you need to make one more step. Here's what I do:
1) create main folder with Polish characters in name
2) copy a few pictures with Polish characters in names into the folder
3) create a subfolder with Polish characters in name
4) copy a few pictures with Polish characters in names into the subfolder
5) add photos from both folders to catalog
6) remove pictures in subfolder from the catalog (do not remove from disc)
7) rename files in the subfolder (I've just added a letter to the name)
8) do "synchronize" on the main folder
9) the synchronization popup shows it will add only the renamed photos from the subfolder, but the result is the pictures in the main folder are imported again (I see duplicated pictures in the library view, each showing the same filename). 

System info as shown by Lightroom:
Lightroom Classic version: 8.1 [ 1200465 ]

License: Creative Cloud

Language setting: en

Operating system: Windows 10 - Business Edition

Version: 10.0.17134

Application architecture: x64

System architecture: x64

Logical processor count: 4

Processor speed: 2,4 GHz

Built-in memory: 7888,7 MB

Real memory available to Lightroom: 7888,7 MB

Real memory used by Lightroom: 1424,1 MB (18,0%)

Virtual memory used by Lightroom: 1681,4 MB

GDI objects count: 757

USER objects count: 2288

Process handles count: 2458

Memory cache size: 511,5MB

Internal Camera Raw version: 11.1 [ 112 ]

Maximum thread count used by Camera Raw: 3

Camera Raw SIMD optimization: SSE2,AVX

Camera Raw virtual memory: 934MB / 3944MB (23%)

Camera Raw real memory: 935MB / 7888MB (11%)

System DPI setting: 96 DPI

Desktop composition enabled: Yes

Displays: 1) 1920x1200

Input types: Multitouch: Yes, Integrated touch: Yes, Integrated pen: No, External touch: No, External pen: No, Keyboard: No

Graphics Processor Info: 

DirectX: NVIDIA NVS 5400M (

Application folder: C:\Program Files\Adobe\Adobe Lightroom Classic CC

Library Path: C:\Users\Rafał\Pictures\Lightroom\Lightroom Catalog-2.lrcat

Settings Folder: C:\Users\Rafał\AppData\Roaming\Adobe\Lightroom

Installed Plugins: 

1) AdobeStock

2) Canon Tether Plugin

3) Facebook

4) Flickr

5) Nikon Tether Plugin

Config.lua flags: None

Adapter #1: Vendor : 10de

Device : def

Subsystem : 21f517aa

Revision : a1

Video Memory : 979

Adapter #2: Vendor : 8086

Device : 166

Subsystem : 21f517aa

Revision : 9

Video Memory : 20

Adapter #3: Vendor : 1414

Device : 8c

Subsystem : 0

Revision : 0

Video Memory : 0

AudioDeviceIOBlockSize: 1024

AudioDeviceName: Głośnik/Słuchawki (Realtek High Definition Audio)

AudioDeviceNumberOfChannels: 2

AudioDeviceSampleRate: 48000

Build: Uninitialized

Direct2DEnabled: false


















GL_VERSION: 4.6.0 NVIDIA 389.08

GPUDeviceEnabled: false

OGLEnabled: true

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Mayuri Jain, Employee

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Hi Rafal,

Could you please check "Show Import dialog before importing" in synchronize Folder pop up and check whether duplicate photos are displayed in the import grid? Also please provide the polish filename that you are using, it could be related to some particular Polish character. A screenshot would be good.

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Rafal Przondo

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Hello, after another check here is the result:
1) First import dialog shows 2 new files to be imported (see screenshot)
2) When "display import dialog" is checked, it shows ALL files, but
3) When I check "do not import suspected duplicates" it shows only the new files (correctly)

So it seems the error can be avoided by checking "do not import suspected duplicates", but the firs import dialog is leading to errors, as it shows only 2 files will be imported, and if I do not check "display import dialog", and subsequently do not check "do not import suspected duplicates", I end up with duplicated images...
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Rafal Przondo

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Things to consider : ensure in a patch, that the synchronization works in the way the first dialog describes (so when it shows 2 photos to import, it will import 2 photos, without need to go to import dialog) or put the checbox "do not import suspected duplicates" in the first dialog, checked by default ? 

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John R. Ellis, Champion

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Hi Rafal,

You screenshot shows a folder name containing two letters with diacritical marks:

Do the problems you've observed occur on folder names or paths (including parent folders) that don't contain diacritical marks?

For many non-English letters with diacritical marks, Unicode has two different representations that visually appear the same (one representation is a single Unicode character that includes the diacritical mark, the other consists of two characters, a letter followed by the diacritical mark). LR has a bug when comparing strings -- it doesn't treat the two representations as the same letter.

If you see the problem only with file paths containing letters with diacritical marks, then that indicates you're tripping over the same bug.

See here for more details on that bug:

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Mayuri Jain, Employee

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Hi Rafal,

Thanks for detailed info. I am able to replicate the issue with diacritical mark. Will log a bug for the same.

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Rikk Flohr, Official Rep

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Updates to Lightroom Classic CC (8.2), Lightroom CC for desktop (2.2), Lightroom CC.Mobile (Android and iOS) were released on Monday, February 11, 2019. Please verify that your issue is fixed by the current update.

Thank you for your patience.
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Rafal Przondo

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It seems the problem is solved with the latest update, or at least it does not occur when I repeat the same steps. Thank you
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Prabal Ghosh, Computer Scientist

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Hi Rafal,
Thanks for confirming the fix.