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macOS Tahoe 26.0 Beta 9 - Bug fixes, changes, and more

Status
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 65816
Original poster
Feb 19, 2022
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b9.png

Release Date ― September 2, 2025
Build Number ― 25A5351b
Apple Silicon System Firmware Version ― 13822.1.2
T2 BridgeOS System Firmware Version ― Pending
New Features & Changes (Found something new? Please press "Edit" on the bottom of this post and add it here)
Resolved Issues
  • Safari tabs blank page issue - when switching between open tabs in Safari - if you hover the mouse over the tab long enough for a mini preview to pop up, when you click the tab, the page will be blank--until you move the mouse. If you're able to click the tab before the preview, the page displays normally.

New Issues
(If you are encountering any issues, please press "Edit" on the bottom of this post and add it here)

Remaining Issues
  • External Hard Drives will show the icon used in Sequoia
  • 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
Untested Issues
Additional Notes
  • This is not currently usable on a day-to-day basis and certain apps may not work. To see those apps, you can check this thread.
  • Please know, Memory Management has always been an issue on any OS (not just Apple's). If you believe there is a Memory Leak, please go to the Apple Menu > Restart > Restart to fix it.
  • 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"
  • macOS 26 Tahoe will be installed via a Delta Update in System Settings. Please be aware about this and 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
    • 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
    • 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 26.0 Release Notes
  • macOS Tahoe Overview
  • Apple Security Updates
  • Become an Apple Beta Tester
  • Full Installer (App Store) (Pending)
  • Full Installer (Direct Download)
 
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Does anyone know if CVE-2025-43300 was patched in this or any of the previous MacOS 26 Beta's? I can't find anything in the patch notes.
 
sumohax0r said:
Does anyone know if CVE-2025-43300 was patched in this or any of the previous MacOS 26 Beta's? I can't find anything in the patch notes.
Click to expand...
We will find out once Tahoe releases, unless this was patched in a Sequoia update then it is patched because of merging git repositories.
 
I'm hoping this one fixes my dock deciding it wants to autohide after X amount of time.

I updated to this & then had an update to Office 365. I'm on the Beta there as well. After the update, Outlook was in the new (crappy) version. I tried to revert back to legacy but it will not revert. I found a post on a Microsoft support site about it & the person there said to change from Beta back to Current. I tried that but I get an error with some Silverlight plugin which stops the check. However, the post also said that Legacy outlook will be permanently retired in October.
This is the article, if anyone cares:
learn.microsoft.com

Microsoft Outlook on Mac - Cannot revert back to Legacy mode - Microsoft Q&A

Hi Support! I'm assisting a user of mine who is having an issue of being unable to revert back to Legacy mode for Outlook. This is on Outlook for Mac. Upon selecting to revert, the app will restart but remain in New Mode. We have tried a restart of the…
learn.microsoft.com
 
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HDJulie said:
I updated to this & then had an update to Office 365. I'm on the Beta there as well. After the update, Outlook was in the new (crappy) version. I tried to revert back to legacy but it will not revert. I found a post on a Microsoft about it & the person there said to change from Beta back to Current. I tried that but I get an error with some Silverlight plugin which stops the check. However, the post also said that Legacy outlook will be permanently retired in October.
This is the article, if anyone cares:
learn.microsoft.com

Microsoft Outlook on Mac - Cannot revert back to Legacy mode - Microsoft Q&A

Hi Support! I'm assisting a user of mine who is having an issue of being unable to revert back to Legacy mode for Outlook. This is on Outlook for Mac. Upon selecting to revert, the app will restart but remain in New Mode. We have tried a restart of the…
learn.microsoft.com
Click to expand...
I just had the update on MS 365 (Beta channel as well) and it's version 16.102, which should be the equivalent pf October 2025 Office in Windows. I would't expect legacy mode to work at all from now on, if it's been confirmed to be EOL in October.
 
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HDJulie said:
I'm hoping this one fixes my dock deciding it wants to autohide after X amount of time.

I updated to this & then had an update to Office 365. I'm on the Beta there as well. After the update, Outlook was in the new (crappy) version. I tried to revert back to legacy but it will not revert. I found a post on a Microsoft about it & the person there said to change from Beta back to Current. I tried that but I get an error with some Silverlight plugin which stops the check. However, the post also said that Legacy outlook will be permanently retired in October.
This is the article, if anyone cares:
learn.microsoft.com

Microsoft Outlook on Mac - Cannot revert back to Legacy mode - Microsoft Q&A

Hi Support! I'm assisting a user of mine who is having an issue of being unable to revert back to Legacy mode for Outlook. This is on Outlook for Mac. Upon selecting to revert, the app will restart but remain in New Mode. We have tried a restart of the…
learn.microsoft.com
Click to expand...
Well that's a bummer. I hate the new Outlook layout.

I guess I have to search for another email program.
 
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My M3 MacBook Air is locked up. It’s behaving a lot like a memory leak / RAM overload, where the UI doesn’t work except after a delay.

I got Activity Monitor to open and there is no RAM leak. I haven’t had any issues like this with DB1-8 but this is severe. Not sure yet what I’ll do about it. I already force-restarted once. Even the mouse is wonky and glitching out.
 
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yukari said:
Well that's a bummer. I hate the new Outlook layout.

I guess I have to search for another email program.
Click to expand...

we had a client with the same issue, escalated through our MS support contract and they sent us Microsoft_Outlook_16.100.25082415_Updater.pkg which worked to "downgrade/upgrade" our client back to a working legacy version.
 
noblesoul117 said:
My M3 MacBook Air is locked up. It’s behaving a lot like a memory leak / RAM overload, where the UI doesn’t work except after a delay.

I got Activity Monitor to open and there is no RAM leak. I haven’t had any issues like this with DB1-8 but this is severe. Not sure yet what I’ll do about it. I already force-restarted once. Even the mouse is wonky and glitching out.
Click to expand...
Strange, My M3 MacBook Air has been running flawlessly on Tahoe (jumped on on the 4th public beta).

I have however been having issues with my M2 Max Mac Studio, where randomly and for no reason it will kernel panic and the left half of my monitor will go black. I have to force restart the machine. Unfortunately Apple doesn't let you run diagnostics on beta versions so I'll have to wait until the public release to test that. I'm not going to spend the time wiping this system (either for a clean install of a beta or back to Sequoia) only to install the final version in a week or two. This issue only happens every 3-5 days. But it never happened on Sequoia in the year I've had this machine, it has been rock solid. Very frustrating.
 
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Schlonz said:
We are back to a b build number. I think we won't see a RC next week.
Click to expand...
All the b means is that this is the second version of 25A5351. Popular to contrary belief, it doesn't mean how "stable" the software is, and a LOT of YouTubers will tell you this.

The B says that Apple saw something and they had to make a second version of this build.
 
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archvile said:
Strange, My M3 MacBook Air has been running flawlessly on Tahoe (jumped on on the 4th public beta).
Click to expand...
Lucky. It doesn't sound like anyone else has a lock-up issue either. Later I will investigate if it's something I have installed, maybe a Menu Bar app.
 
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silvertech said:
Everything seems to be running fine on M4 MacBook Air. However I noticed that Ice, the menu bar organizer app crashes upon opening. Really liking the design of Tahoe.
Click to expand...
There are a number of issues that need to be worked out for Ice (you can see issues logged at GitHub). They have a beta version out that worked with early Tahoe betas but I'm not sure if it works with the current ones. I imagine that they will have a proper release around the time of the Tahoe launch.

This is one of a few apps that I am paying attention to and will not upgrade to Tahoe until it is sorted out.
 
noblesoul117 said:
My M3 MacBook Air is locked up. It’s behaving a lot like a memory leak / RAM overload, where the UI doesn’t work except after a delay.

I got Activity Monitor to open and there is no RAM leak. I haven’t had any issues like this with DB1-8 but this is severe. Not sure yet what I’ll do about it. I already force-restarted once. Even the mouse is wonky and glitching out.
Click to expand...
My freezing UI issue might've been due to the Bartender 6 test version. For now I've quit using it.

Edit: And apparently someone else did experience this; I should've read the apps compatibility list! "Bartender 6 (Alpha 4) - Slows down the Mac as if eating an extreme amount of CPU. Notified developer."
 
Hi! I am trying to use the spotlight search. When I opened spotlight, if I didn't find what I needed in the list, I used to be able to click on the "Open in finder" in prior versions of Mac OS's. I really like this feature and have been using it for years. After researching online, it doesn't look like this is an option any more. Am I correct, or is there a setting I need to chage. I use this way to search multiple times a day, so any help would be greatly appreciated! I especially use it to search for and open installed applications I have (I have 92 applications right now that I don't want on my dock)
 
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