[Bug]: Starting with Windows client version 33.0.3 files are frequently appearing busy or locked

[ChrisG0x20]

⚠️ Before submitting, please verify the following: ⚠️

• This is a bug, not a question or a configuration issue.
• This issue is not already reported on Github (I've searched it).
• Nextcloud Server and Desktop Client are up to date. See Server Maintenance and Release Schedule and Desktop Releases for supported versions.
• I agree to follow Nextcloud's Code of Conduct

Bug description

After updating the Windows desktop client to version 33.0.3, files in my nextcloud folder frequently report being busy or locked and are not accessible to other applications.

Steps to reproduce

1. Install and update Windows 10
2. Install and update nextcloud desktop client version 33.0.3
3. Copy Obsidian app markdown files into local nextcloud folder
4. Use Obsidian app for a while

Result:

Expected behavior

These error messages started immediately after updating the nextcloud desktop client. I would like the error messages to stop.

Which files are affected by this bug

Multiple markdown files in my Obsidian folder within my nextcloud share folder.

Operating system

Windows

Which version of the operating system you are running.

Window 10 (10.0.19045)

Package

Other

Nextcloud Server version

Nextcloud Hub 26 Winter (33.0.2)

Nextcloud Desktop Client version

33.0.3

Is this bug present after an update or on a fresh install?

Updated from a minor version (ex. 3.16.1 to 3.16.2)

Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

Are you using an external user-backend?

• Default internal user-backend
• LDAP/ Active Directory
• SSO - SAML
• Other

Nextcloud Server logs

Additional info

Desktop Client Logs are full of personal information. Is there a method of exporting without security certificates and other personal details?

[BENZatMPEN]

Slow Sync, Previous Version can sync a 1 MB file in 30 seconds, Now it takes around 5-10 minutes.

[fischanger]

I confirm. Windows desktop client causes the explorer to get stuck and the synch is very very slow after upgrading to 33.0.3

[karagian]

Same issue here. Attempting to save office documents directly on nextcloud folder results in a vague "An error occurred while saving the file" the first time, even though the file gets saved successfully, and the second time you press save a similar message to the one reported here. That the file is read only and cannot be saved and asking a new filename to save the file.
Saving with a new filename works, but then saving again has the same issue.

[schmitz-ens]

Issue confirmed here with PowerPoint and Nextcloud 33.0.3 : "An error occurred while saving the file" the first time, even though the file gets saved successfully, and the second time you press save a similar message to the one reported here. That the file is read only and cannot be saved and asking a new filename to save the file.
Saving with a new filename works, but then saving again has the same issue.

Seems new.

[stesmi]

Nextcloud Desktop Client in Windows 11 25H2, 33.0.3:

• LibreOffice Calc : Open a file, press ctrl+s with just under 1s between saves : error message after 4–6 attempts, file system contains a zero-byte file.
• LibreOffice Calc : Open the same file, press ctrl+s with ~5s between saves: error message after 8 attempts, file system contains a zero-byte file.

Selected "Pause Sync" in client.

• LibreOffice Calc : Open the same file, press ctrl+s with just under 1s between saves : count to 50 attempts. No issues.

Started syncing again, same problem as above.

Downgraded to Nextcloud 33.0.2:

• LibreOffice Calc : Open the same file, press ctrl+s with just under 1s between saves : count to 50 attempts. No issues.

I've disabled auto-update for now.

Let me know how I can help.

EDITS: Clarification, more data.

[heisian]

I am running into issues exactly as described here:

First issue:
When using .xlsx files, while saving I suddenly always get the error message from Excel that there is some kind of accessing conflict and that the file was saved but could not again be opened. Subsequent attempts to safe will result in a prompt to save as new file.

Second issue:
When copying files from one Nextcloud folder to another (via client), some files randomly are not synced, no attempt seems to be made to sync (no syncing icons on the file symbols). The Nextcloud client itself shows the green arrow and that all files have been synced. Accessing the folder via browser shows these files have not been synced. When restarting the client these files are synced normally.

Both issues seem to have been solved by downgrading the desktop client vom 33.0.3 to 33.0.2.

https://help.nextcloud.com/t/desktop-client-33-0-3-on-win11-problems-saving-xlsx-and-randomly-not-syncing-files-solved-by-downgrading-to-33-0-2/243927

In addition, I experienced the file saving error not just on .xls files but a .dwg file as well.

As others have also mentioned, sync seems to be slow or not working at all (I didn't wait the 15 minutes reported, because I needed files to sync ASAP).

[lrberge]

Similar issue on Win 11 25H2, Nextcloud Desktop Client 33.0.3

Nextcloud does not sync. Whenever I try to sync Nextcloud, the "AntiMalware Service Executable" starts and runs at 10% CPU (and Nextcloud runs at about 0% CPU). When I pause syncing, "AntiMalware Service Executable" disappears. So the sync seems to be blocked.

[mateuszzadorski]

Same issue on W11 25H2 26200.8246, Nextcloude Desktop 33.0.3 for MS Office files, trying to save produces an error about "sharing violation"

[jmaulwurf]

Same issue on W11 25H2 26200.8246, NC Client 33.0.3 with .xlsx files.

Additionally, randomly some files will receivce no sync attempt by the NC desktop app (no syncing arrows on the file icons), the app itself shows green arrow and no conflicts or pending files, accessing via browser shows the files were not synced. Restarting the NC client app helped temporarily, the issues returned immediately.

Downgrading to NC desktop client 33.0.2 seemingly solved both issues.

[sbourdeaud]

For those of you wondering (like me) where to download previous versions of the client: download archive

Reverting to v33.0.2 also fixes issues for me.
My main symptom was Windows Explorer hanging for a few minutes while it was waiting for the Nextcloud shell extensions to load.

[JasMan78]

Same here. Noticed that it only freezes when the syncs to SMB shares are enabled. When I pause them, the sync for my local folders runs smooth and fast.