Nextcloud running but can't open windows

[jamespoore]

⚠️ 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

I'm running Tahoe 26.3 (25D125) and after opening Nextcloud client no system tray icon shows. I can see Nextcloud is running in activity monitor.

If I remove the app with AppCleaner and do a fresh install I get the welcome configuration window. Complete sign in, select folders to sync and close the window, there is no way to open it again.

Steps to reproduce

1. Install latest 4.0.6 client
2. Complete sign-in and select folders for sync
3. Close sync window
4. No system tray icon exists to reopen
5. Check Activity Monitor for process (present)
6. Quit process
7. Attempt to re-open, still no system tray icon
8. Sync appears to be taking place however

Expected behavior

Should be able to re-open sync/settings window

Which files are affected by this bug

4.0.6

Operating system

macOS

Which version of the operating system you are running.

Tahoe 26.3 (25D125)

Package

Official macOS 12+ universal pkg

Nextcloud Server version

Nextcloud Hub 25 Autumn (32.0.6)

Nextcloud Desktop Client version

4.0.6

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

Fresh desktop client install

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

Seems to be a client issue but can provide if really required

Can't open client to provide debug logs

Additional info

No response

[jamespoore]

Found this similar post describing the same issue, but different versions.

https://help.nextcloud.com/t/gui-not-showing-after-initial-install-and-config-on-mac-os-12-7-4/228590/2

Showing package contents and opening the Nextcloud executable is the only way I've found so far to get the GUI to reappear. Obviously this isn't ideal.

[kesselb]

Hello,

I'm seeing a similar issue on Ubuntu 25.10 with 4.0.6. The tray icon isn't visible.

Starting the client prints:

qt.qpa.plugin: Could not find the Qt platform plugin "wayland" in ""
Failed to initialize instances shared memory:  "QSharedMemory::handle: doesn't exist"
...
XIO:  fatal IO error 2 (No such file or directory) on X server ":0"
      after 436 requests (436 known processed) with 0 events remaining.

4.0.3 works fine.

[i2h3]

@jamespoore You use classic synchronization folders and not the file provider extension, right?

You can access the logs of the client directly through Finder, too. If I recall correctly (I am working with a newer version with different locations since a while now), for 4.0.6 they should be located in ~/Library/Preferences/Nextcloud/logs. Note that they may contain sensible metadata.

[jamespoore]

I guess so @i2h3 I'm not using the virtual files client if that's the difference.

I've reviewed the logs which seem to just contain sync information nothing suggesting why the GUI won't open. I cannot open the GUI application at all, nothing in the task bar.

[jamespoore]

Any suggestions on how I can troubleshoot this @i2h3 ? As you can see when running it from the terminal does get it to open, but no menu bar icon to get back here after clicking somewhere else. I also tried the virtual files installer and its the same. Also the 33.0rc so now back on 4.0.6.

This "solution" after some time stops working and I have to reboot the Mac for the terminal method to work.

[jamespoore]

This is still a bug on 33.0.2 which is disappointing.

Further tried:
Disabled Adobe file provider extensions referenced on the forum. No change.
Removed folder sync, account and then Nextcloud app, remove files mentioned in #8674, re-installed. Still same issue.