macOS Tahoe 26.1 - Bug fixes, changes, and more

[Rastafabi]

Anyone else having issues with fullscreen mode? Basically any app no matter whether internal or third party ones have UI issues in fullscreen mode for me. Especially prominent, but not limited to Maps.app an Music.app.

I already filled an issue:

Spoiler

Broken Fullscreen UI | FB21061980

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Anyone got any idea which setting files to delete to potentially fix this?

 

[thadoggfather]

Anyone else having annoying brightness flicker at times?

Happened since Tahoe and still not resolved with 26.1

I do not like it one bit

15 Inch MacBook Air m2

 

[schmalen]

macOS Tahoe 26.1 – Missing Passwords/Usernames in Passwords App – Anyone Else Experiencing This?

Over the past few weeks, I’ve noticed that several of my saved passwords including usernames have completely disappeared from the Passwords app. I’ve been running macOS Tahoe 26.1 since its release.

Here’s what’s strange:

At my main bank, I have two accounts. For one of them, the password and username are still present when I try to log in — but for the other, both fields are completely empty. Previously, the credentials were automatically filled in when I clicked on the login field.

The same thing is happening with another service provider: one account shows the username and password completely, while the other is again missing from the fields. Here too, the missing credentials were previously offered automatically for selection when logging in.

Additionally, several login entries for online portals I regularly use have also disappeared entirely.

Has anyone else experienced something similar, where Tahoe seemingly randomly loses individual logins or password entries?

Is there a reliable way to restore the missing entries from a backup (e.g., Time Machine or iCloud Keychain sync)?

So far, I haven’t found a working method.

Note:

I haven’t changed any system settings, and I never had this issue before Tahoe. I’ve been using macOS since the very first “X” version, and I’ve never encountered anything like this.


P.S.

Update / Addition:

I’ve looked into the issue further and collected some observations that might help pinpoint the cause.

Addition – Observed cause:

It appears to be a system bug in macOS Tahoe 26.1 (and possibly iOS 26) that deletes or fails to properly sync Keychain entries.

On iOS, automatic login in Safari still works even though the entries are missing in the Passwords app.

macOS requires the Keychain files locally; since the passwords are missing there, automatic logins do not work.

Conclusion:

• This seems to be a system-wide bug affecting both macOS Tahoe 26.1 and iOS 26.
• iOS can still perform certain logins even though the Passwords app does not display the data.
• On macOS, the missing Keychain entries are immediately noticeable because there are no background login data available.

 

[donawalt]

I still get crashes in the Music app when it's just open but not playing:

• Triggered by Thread: 0 Music main
• Exception Type: EXC_BAD_ACCESS (SIGSEGV)
• Exception Subtype: KERN_INVALID_ADDRESS

I tried:

• Nuked Music cache / extension containers (MusicCacheExtension, MusicStorageExtension, MPMusicPlayerApplicationControllerInternal)
• Nuked ~/Library/Caches/com.apple.Music* and com.apple.iTunes*

There is more I could do but until 26.2 is out I am just closing the app until I want to play music from it.

Since the crash came back as quickly as within a couple of hours:

• It’s not stale caches
• It’s not bad downloaded media
• It’s not a damaged local database (I have no downloads, it's an iCloud-only library. My iCloud Music is just streamed when needed)

So I have ruled out that my library is corrupt (no library locally), and the local cache is corrupt.

Anyone else having issues with Music app crashes?

 

[gank41]

Still my main issue is with the Music app repeatedly trying to reopen itself when I quit the app. I’ve checked for what apps have access to the Music app and I’m just not seeing anything. For any app, even, that COULD have access, I’ve gone thru and made sure it was off. This wasn’t happening pre macOS 26.1 (and continues thru the latest beta) and it’s not happening on my Intel Mac mini still on macOS 15.whatever is current.

 

[daneoni]

I still get crashes in the Music app when it's just open but not playing:

• Triggered by Thread: 0 Music main
• Exception Type: EXC_BAD_ACCESS (SIGSEGV)
• Exception Subtype: KERN_INVALID_ADDRESS

I tried:

• Nuked Music cache / extension containers (MusicCacheExtension, MusicStorageExtension, MPMusicPlayerApplicationControllerInternal)
• Nuked ~/Library/Caches/com.apple.Music* and com.apple.iTunes*

There is more I could do but until 26.2 is out I am just closing the app until I want to play music from it.

Since the crash came back as quickly as within a couple of hours:

• It’s not stale caches
• It’s not bad downloaded media
• It’s not a damaged local database (I have no downloads, it's an iCloud-only library. My iCloud Music is just streamed when needed)

So I have ruled out that my library is corrupt (no library locally), and the local cache is corrupt.

Anyone else having issues with Music app crashes?

Haven't noticed this yet. My issue with the app itself is that it doesn't remember window adjustments when you quit it and there is a permanent horizontal scroll bar regardless of window size
But it hasn't crashed...yet

 

[johnkree]

I hoped they fixed the Dock in 26.1 but suddenly it was gone and changed settings to auto hide. How, Apple, how can it be that this bug is still there?

 

[fivenotrump]

Screen Sharing no longer works at all unless you log in physically on the device first. Sure wish I would've discovered that before upgrading my server, which is now essentially useless.

You can ssh to unlock the data volume: see the man page apple_ssh_and_filevault(7)