macOS Tahoe 26.0 Beta 2 - Bug fixes, changes, and more

[adrianlondon]

Mac user since 1989. With Tahoe beta 2, my 2019 i9 MBP became unusable. Safari, Mail, Notes, TextEdit, Zoom and others were crashing upon launch. Impossible for me to fix. Countless messages to Feedback, not one answer. In desperation, I explained the issues to Perplexity who said Reset the Font Book. Wot? How could that fix this issue? I never even knew that you ciuld reset the Font Book. Found the button, Reset, restarted the MBP, and everything is now fine. I am gobsmacked. Such a totally non-obvious simple solution.

Feedback is for letting Apple know about bugs. Unfortunately, it's not for support. They are unlikely to respond, and if they do it will only be to ask for more info, or to say it may be fixed in a later beta, even if they know there's a manual fix or workaround.

There have been posts on here about apps crashing and that resetting the user fonts fixes the issue. I believe the posts here on that topic were originally a cut/paste from a reddit thread.

I understand that many people using the betas aren't developers, but the crash logs (if one cares to look) do point to it being a font issue, although without the benefit of hindsight I probanbly wouldn't have spotted it!

1 WebKit 0x1c5cb2154 WebKit::addUserInstalledFontURLs(NSString*, WTF::HashMap<WTF::String, WTF::URL, WTF::DefaultHash<WTF::String>, WTF::HashTraits<WTF::String>, WTF::HashTraits<WTF::URL>, WTF::HashTableTraits, (WTF::ShouldValidateKey)1, WTF::FastMalloc>&, WTF::Vector<WTF::URL, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&) + 684

https://www.reddit.com/r/MacOSBeta/comments/1lon5z1/all_adobe_apps_crash_on_launch

https://www.reddit.com/r/MacOSBeta/comments/1lo3fcs/did_someone_find_an_alternative_to_the_reset

 

[snipper]

I'm experiencing Mail and Notes columns gradually becoming wider. Reset it and over time it keeps creeping so it's wider. Sometimes the column listing emails or notes titles/subjects is wider than the content of the note/message.

In Sequoia, Mail keeps setting my columns back to unusable small widths since day 1. Whenever I go back ant forth between the inbox and concept folder, for example. Very annoying. Tried rebuilding folders, deleting mail preferences. I really hope this gets fixed. I found this thread while looking for a fix, for the n[sup]th[/sup] time.

BTW why is bb code for superscript not working?

 

[Joseph C]

Hoping for Beta 3 today with Safari black tab fix (and perhaps compact tabs coming back... can but dream) and the Mac App Store app updates working again. 🙏🏼


PS - We don't have a macOS 26 Beta Speculation Thread like iOS does, if people object to messages like this in the current beta bugs/changes thread we could set one up?

 

[Joseph C]

You may want to use mas-cli as a workaround in the meantime:

mas outdated

mas upgrade

edit: or Latest, if you prefer a GUI

Just seen this. Downloaded the GUI and I have 30(!!) updates, dating back to WWDC/Tahoe Beta 1 install day.

Thanks a million for that.

 

[StellarVixen]

Hoping for Beta 3 today with Safari black tab fix (and perhaps compact tabs coming back... can but dream) and the Mac App Store app updates working again. 🙏🏼


PS - We don't have a macOS 26 Beta Speculation Thread like iOS does, if people object to messages like this in the current beta bugs/changes thread we could set one up?

Don't know if it will be today but it "should be" this week.

 

[gank41]

In Sequoia 15.5, I cannot move the Finder icon in the Dock, nor can I place anything to the left of it.

I'm also seeing this behavior on the macOS 15.6 beta

 

[StellarVixen]

Bit the bullet and installed beta 2.

Window titles are left aligned now, has this been mentioned?

Also, space bar isn’t mapped to quick look anymore. Quick look is still there, it’s just that space bar doesn’t activate it.

Edit: it started working suddenly now, I guess it’s a bug and not intended behavior.

 

[Adora]

Nothing new today. The time is up.

 

[Adora]

Hoping for Beta 3 today with Safari black tab fix (and perhaps compact tabs coming back... can but dream) and the Mac App Store app updates working again. 🙏🏼


PS - We don't have a macOS 26 Beta Speculation Thread like iOS does, if people object to messages like this in the current beta bugs/changes thread we could set one up?

There are always much less posts than in the iOS Beta threads. Maybe we could just speculate here too. These 10 pages now already is an exception because there is so much new and more bugs in this macOS version.

But you can make a speculation thread if you like. I am mostly just here and not in the news thread about the release. One thread is enough for me.

 

[Adora]

Oh! 🙃

 

[iBookmaster]

Oh! 🙃

View attachment 2526624

9 To 5 Mac is reporting the update is available only to Intel users. Wow.

 

[redcarian]

My M1 Pro is updated with Beta 3:

System Software Overview:

System Version:    macOS 26.0 (25A5306g)
Kernel Version:    Darwin 25.0.0