[Bug]: Windows client crashes after a few minutes, breaks windows right-click and crashes windows explorer

[flckf]

⚠️ 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

Windows nextcloud client crashes shortly after starting (anywhere between seconds and minutes) and becomes unresponsive
Breaks windows explorer, causing right click on any file/ folder to cause explorer to crash (clicking on empty space is ok)
At some point the icon will disappear from the taskbar but the process is still running in task manager (and consuming resources)
Killing the nextcloud process results in windows working normally again

Occurred directly after upgrading to client version 3.10.0-x64
Server is up to date

Steps to reproduce

1- Boot into windows
2- Client loads, taskbar icon green tick, mouse hover over says preparing to sync, occasionally will start syncinc (icon changes, popup menu on mouse click shows files syncing). Windows explorer works normally
3- Client stops responding. Icon doesn't change. Mouse hover does nothing. Left or mouse click on the taskbar icon does nothing
4- Right clicking on a file or folder in windows explorer (at any location- whether in the nextcloud folder or not) causes explorer to hang and become unresponsive. Needs explorer reboot.
5- Kill nextcloud from task manager, windows works normally again.
6- Restart nextcloud client - same thing happens from stage 2 above.

Expected behavior

Nextcloud loads, syncs and windows works normally

Which files are affected by this bug

Any file or folder in windows explorer

Operating system

Windows

Which version of the operating system you are running.

Windows 10

Package

Appimage

Nextcloud Server version

27.1.1

Nextcloud Desktop Client version

3.10.0

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

Updated from a minor version (ex. 3.4.2 to 3.4.4)

Are you using the Nextcloud Server Encryption module?

Encryption is Enabled

Are you using an external user-backend?

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

Nextcloud Server logs

No response

Additional info

I can only create the debug archive in the few seconds after restarting the app and before it crashes. Log is also 121mb so I can't upload it

[f2k1de]

Same problem here. 3.10.0 on Windows with 27.1.1

[sfeurerbuteo]

Same...
also noticing unusally high CPU usage on sync client process
"Believe" the behaviour started after latst Windows update KB5030651

Windows 11
Windows Sync Client 3.10.0.45827
Nextcloud Server 27.1.1

[technolooge]

Hi,

same Problem here. Disabling GData's Antivirus and restarting Nextcloud Client AND Explorer Process, seems to Fix the Problem, but it can't be the final Solution.

System is: Windows 10 Professional 22H2, freshly installed
Nextcloud Client: 3.10.1
GData Antivirus: latest Version and latest Definitions

Any hints?

[flckf]

I solved the problem by uninstalling completely/ deleting all registry entries etc using revouninstaller and reinstalling the same version. Doing a simple uninstall/ reboot/ reinstall and all other variations didn't work

[technolooge]

@flckf:
Can confirm: Only Uninstall and Reinstall will not work. Tryed this yesterday.

[srjmas]

Same here. Tried moving to an old version but the symptomps remained

[srjmas]

I solved the problem by uninstalling completely/ deleting all registry entries etc using revouninstaller and reinstalling the same version. Doing a simple uninstall/ reboot/ reinstall and all other variations didn't work

This worked!
Thank you!!

[Microlytix]

Similar here.
Nextcloud Client 3.12.2
Windows 10 22H2 (March24 Update)
AV: Microsoft Defender

Since last Nextcloud client update explorer crashes on right click.
Migitation:
Stop Nextcloud client
Issue disappears
restart NC client
right click works

[PhilippSchlesinger]

Similar here. Nextcloud Client 3.12.2 Windows 10 22H2 (March24 Update) AV: Microsoft Defender

Since last Nextcloud client update explorer crashes on right click. Migitation: Stop Nextcloud client Issue disappears restart NC client right click works

@Microlytix Probably your issue is rather caused by #6566

[Microlytix]

Similar here. Nextcloud Client 3.12.2 Windows 10 22H2 (March24 Update) AV: Microsoft Defender
Since last Nextcloud client update explorer crashes on right click. Migitation: Stop Nextcloud client Issue disappears restart NC client right click works

@Microlytix Probably your issue is rather caused by #6566

Thanks, @PhilippSchlesinger
That's right.

[liunux4odoo]

downgrade client to 3.12.4 solves my problem.