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macOS Tahoe 26.4 RC - Bug fixes, changes, and more

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The first post of this thread is a WikiPost and can be edited by anyone with the appropiate permissions. Your edits will be public.
WilliApple

WilliApple

macrumors 68000
Original poster
macOS 26 banners.png

Release Date ― 18 March 2026
Build Number ― 25E243 / 25E241
Apple Silicon System Firmware Version ― 18000.101.7
T2 BridgeOS System Firmware Version ― 23.16.14242.0.0
New Features & Changes (Found something new? Please press "Edit" on the bottom of this post and add it here)
Resolved Issues
New Issues
(If you are encountering any issues, please press "Edit" on the bottom of this post and add it here)
Remaining Issues
  • When filling your screen with the App Store, the title of the View may be wider than expected
  • On non notched devices, the volume indicator may have excessive padding in full screen (Present since 26.2 Beta 3)
Untested Issues
  • Alarms may not play when your display is asleep for a long period of time (FB10086690)
    • Workaround: Make your display not fall asleep in Settings > Lock Screen > Turn display off on ____ when inactive. You can turn your brightness off.
    • Issue present since macOS 13.0
Issues Information: When a new macOS release comes out, all issues automatically go to "Untested Issues" until they are moved by someone. Issues that stay in Untested for 3 releases (beta or smooth) will be removed from all future threads. When there is a new macOS release, please be sure to let us know about the issue's status by moving it to either "Remaining Issues" or "Resolved Issues"

Additional Notes
  • Updates might not show up in Settings as soon as it releases if you have Rosetta 2 installed. This is due to Apple not releasing Rosetta at the same time as macOS Tahoe Betas. Please wait up to an hour before you will be able to update.
  • If you are encountering a memory management issue (eg. a Memory Leak), please provide what app/process it is coming from (Using Activity Monitor) and what you were doing in that app.
  • macOS 26 Tahoe will be installed via a Delta Update in System Settings. Please be aware about this, as the update won’t install with an installer.
  • macOS 26 is officially supported on the following devices. If your device is not listed below, it has unfortunately been dropped by Apple. Any efforts of trying to get your Mac running macOS 26, including bugs should be discussed in this thread.
    • MacBook Air: M1, M2, M3, M4, M5
    • MacBook Pro: 2019 (16 Inch only), Intel 2020 (4 thunderbolt port only), M1, M1 Pro/M1 Max, M2, M2 Pro/M2 Max, M3/M3 Pro/M3 Max, M4/M4 Pro/M4 Max, M5, M5 Pro/M5 Max
    • MacBook Neo: A18 Pro
    • Mac mini: M1, M2/M2 Pro, M4/M4 Pro
    • iMac: 5K 2020, M1, M3, M4
    • Mac Pro: 2019, M2 Ultra
    • Mac Studio: M1 Max/Ultra, M2 Max/Ultra, M3 Ultra, M4 Max
  • macOS Tahoe 26.4 Release Notes
  • macOS Tahoe Overview
  • Apple Security Updates
  • Become an Apple Beta Tester
  • Full Installer (Direct Download) - usually unavailable for RC
 
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WilliApple said:
Build Number ― Pending
Click to expand...
there are 2 build numbers

25E241 and 25E243

so is this like one build for some macs, different build for others?

or is it like 2 rcs released only within hours of each other?

so 2 scenarios:

2 builds for RC1 simultaneously: 25E241 and 25E243

or is it actually

RC1: 25E241
RC2: 25E243

?
 
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My Time Machine backup to a Samba (SMB) share is still failing with a user/password error - this started a couple of betas ago.

It's also affecting other people (e.g. on Reddit posts). TM backups to local disks aren't affected, and continue to work well.
 
Just installed this on my Mac Studio. Have been running 26.4 for a little while on my MacBook Air.

I have liquid glass set for tinted. On the MBA, it's opaque. On my Mac Studio, it's still liquid glass despite having it set for tinted.
 
My 16" M1 Max, which had been running 26.4b4, downloaded 18GB of RC Version 26.4 (25E241)

All is running very smooth.
 
0 visual inconsistencies have been fixed. It's especially noticeable in native full-screen apps, such as with the lyrics bar in Music or the edit bar in Photos. I don't understand the black bar in Weather either. 🤷🏼‍♂️

Edit : Oh, and new windows in Finder still flicker on the top left, in light mode at least...
 
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adrianlondon said:
My Time Machine backup to a Samba (SMB) share is still failing with a user/password error - this started a couple of betas ago.

It's also affecting other people (e.g. on Reddit posts). TM backups to local disks aren't affected, and continue to work well.
Click to expand...
Yes, I'm also affected with the RC. Hoping for a fix within the final release.
 
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adrianlondon said:
As Apple aren't collating feedbacks (mine says "none" for similar reports, despite the fact I know others have logged this issue) I assume this won't be fixed in 26.4. Apple will then act all surprised when people start complaining and come out with a fix in the next release.
Click to expand...
There was a time when every piece of feedback I submitted would gradually be updated with links to other reports of the same issue. But nothing happened—the “similar reports” counter stayed at zero. In the end, I gave up; I send feedback… without expecting anything in return.
 
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GeekBenchmarks have significantly improved across board in this RC (25E241) compared to 26.4b4.

Performance on CPU is back to equal that of Sequoia 15.4, GPU (Metal) is 2% better, and AI roughly same.

[as tested 2 days apart on 16" M1 Max]

Am encouraged that I won't have to revert to Sequoia after all (following inadvertent Tahoe upgrade 10 days ago) ";0))
 
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This finally fixed an issue I had with iPhone Mirroring and typing where input languages would switch every few minutes and with it changed keyboard layouts so I had to keep checking typed text. It's been that way since the introduction of iPhone Mirroring.
 
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Tahoe26.4-RC-AboutThisMac.png

Just updated to this version; I also got 25E241 as the build number. I'm pretty sure that given the previous replies I've seen on here, 25E243 is only available as an IPSW restore file.
 
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BGS said:
GeekBenchmarks have significantly improved across board in this RC (25E241) compared to 26.4b4.

Performance on CPU is back to equal that of Sequoia 15.4, GPU (Metal) is 2% better, and AI roughly same.

[as tested 2 days apart on 16" M1 Max]

Am encouraged that I won't have to revert to Sequoia after all (following inadvertent Tahoe upgrade 10 days ago) ";0))
Click to expand...

Geekbench has never measured UI performance. If all those benchmark numbers stay the same or even improve but SwiftUI performance drops then the operating system feels slower to use no matter what the benchmarks say.
 
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