We’ve encountered what appears to be a CoreML regression between macOS 26.0.1 and macOS 26.1 Beta. In macOS 26.0.1, CoreML models run and produce correct results. However, in macOS 26.1 Beta, the same models produce scrambled or corrupted outputs, suggesting that tensor memory is being read or written incorrectly. The behavior is consistent with a low-level stride or pointer arithmetic issue — for example, using 16-bit strides on 32-bit data or other mismatches in tensor layout handling. Reproduction Install ON1 Photo RAW 2026 or ON1 Resize 2026 on macOS 26.0.1. Use the newest Highest Quality resize model, which is Stable Diffusion–based and runs through CoreML. Observe correct, high-quality results. Upgrade to macOS 26.1 Beta and run the same operation again. The output becomes visually scrambled or corrupted. We are also seeing similar issues with another Stable Diffusion UNet model that previously worked correctly on macOS 26.0.1. This suggests the regression may affect multiple diffusion-style architectures, likely due to a change in CoreML’s tensor stride, layout computation, or memory alignment between these versions. Notes The affected models are exported using standard CoreML conversion pipelines. No custom operators or third-party CoreML runtime layers are used. The issue reproduces consistently across multiple machines. It would be helpful to know if there were changes to CoreML’s tensor layout, precision handling, or MLCompute backend between macOS 26.0.1 and 26.1 Beta, or if this is a known regression in the current beta.

Hi everyone, My TestFlight build has been stuck in 'Waiting for Review' for over 32 hours and I'm hoping someone can help or share their experience. The situation: I have an External Testing group with a Public Link set up. The build was submitted for Beta App Review on March 19th but it's been over 32 hours with no update. I have 25+ testers waiting to install the app. What I've tried: Waited patiently Checked App Store Connect multiple times No rejection emails received No issues flagged by Apple Questions: Is anyone else experiencing unusually long review times for TestFlight external builds right now? Is there anything I can do to speed up the process or check if something is wrong? Has anyone successfully resolved this by contacting Apple Developer Support directly? Any advice would be greatly appreciated. Thank you! Apple Support Case ID: 102846633409

I just installed Xcode 26.4 RC (17E192) yesterday and found that the documentation window now omits Foundation for me. Searching for "Date" finds the date property from GameKit, Core Data, ... but no Date type. I was previously using 26.4 beta and this was not the case. Is anyone else seeing the same thing?

Hardware: • Mac Studio (M1 Ultra) • Apple Silicon • Sufficient free disk space (~35GB+ available) • SIP enabled • 4 local Time Machine snapshots present Current System: • Already running macOS Tahoe beta • Attempting upgrade to macOS Tahoe 26.4 Beta (Build 25E5207k) Primary Issue: Software Update downloads successfully, then moves to “Preparing…”. It stalls at “About 5 minutes remaining” for ~10–15 minutes and fails with: “Failed to prepare the software update. Please try again. An error occurred while downloading the selected updates.” The error appears network-related, but download always completes. Observed Behaviour: • “Checking for Updates” completes in <3 minutes. • softwareupdated and mobileassetd CPU usage <1%. • softwareupdate --history shows no record of the failed beta install. • No excessive system load or obvious disk pressure. Steps Already Attempted: 1. Standard Software Update retries • Multiple download/retry cycles from System Settings. • Same Preparing failure every time. 2. Permissions / Disk Access • Granted Terminal Full Disk Access. • SIP remains enabled. • Some system-protected locations still return “Operation not permitted”. 3. Cache / State Cleanup Attempts • Removed /Library/Updates/*. • Cleared temporary softwareupdate folders under /private/var/tmp. • Attempted MobileAsset cache cleanup where permitted. • Killed softwareupdated and mobileassetd processes (auto-restarted by launchd). 4. Beta Channel Reset • Turned Beta Updates OFF in System Settings. • Rebooted. • Re-enabled Beta Updates. • Forced catalog refresh via softwareupdate -l. 5. Snapshot Check • tmutil listlocalsnapshots / shows only 4 snapshots (normal range). 6. Full Installer Workaround softwareupdate --list-full-installers shows: • macOS Tahoe Beta 26.4 (25E5207k) • Tahoe 26.3 / 26.2 / 26.1 • Sequoia / Sonoma / Ventura / Monterey installers Downloaded installer via: softwareupdate –fetch-full-installer –full-installer-version 26.4 Installer downloaded correctly: /Applications/Install macOS Tahoe Beta.app 7. startosinstall Method (Apple Silicon optimized) Attempted install with: sudo “/Applications/Install macOS Tahoe Beta.app/Contents/Resources/startosinstall” –user –agreetolicense –nointeraction –forcequitapps –rebootdelay 30 –passprompt Authorization succeeds, installer begins preparing, but installation still ultimately fails. Additional Notes: • CPU usage remains low during failure. • No excessive snapshot count. • Error messaging consistently references download/network even though download completes. • Issue appears to occur during cryptex/asset preparation phase rather than initial download. Question for Apple / other developers: Has anyone else seen Tahoe 26.4 beta fail specifically during the Preparing phase on Apple Silicon (especially Ultra-class chips)? Looking for confirmation whether this is a known MobileAsset or cryptex staging issue, or if logs indicate a deeper APFS / volume-owner authorization problem.

I work on an SDK, and one of the ways we distribute it is as a pre-compiled static XCFramework. As far as I know, it’s the nature of a static framework to not contain symbols since the framework will be embedded in the final app binary, and the symbols should then be generated. However, when testing the "Validate" function of the Xcode 16 deployment process, our users are receiving a warning that says the framework does not contain symbols. Is my assumption about static frameworks and symbols incorrect? Could this be a bug in Xcode 16? Should we modify something in our framework to inform Xcode that symbols are not needed?

Hi everyone, I’m testing an iPhone app called Steady through TestFlight and would love honest feedback. Steady is built for the moment right before someone acts on an urge they may regret. The core idea is to create a short pause before action, then let the user log what happened so they can spot patterns over time. Use cases could be things like sending a text you shouldn’t, reacting too fast, opening something you wanted to avoid, or other impulsive moments. I’m mainly looking for feedback on three things: Does the concept feel useful in real life? Is the flow clear or confusing? What feels unnecessary or missing? TestFlight link: https://testflight.apple.com/join/YsnDsGR5 Appreciate any honest feedback.

On one of my machines (new MacMini M4Pro) I can’t add any new VPN configuration, doesn’t matter what I use. Trying to set up Tailscale, I get to the point where Tailscale brings up the "Allow VPN configuration" panel. If I hit the "Allow VPN Configuration" button, then macOS pops up its own panel: "Tailscale" Would Like to Add VPN Configurations All network activity on this Mac may be filtered or monitored when using VPN. [Allow] [Don’t Allow] I hit the allow button, and after a short wait the Tailscale panel shows in red "You must allow this to use Tailscale". I can repeat this as often as I want, but Tailscale isn’t added to the VPN configurations. If I use any other third party VPN app, I get similar results: nothing gets added to the VPN configurations. If I use macOS’s System Settings and hit the "Add VPN Configuration" pop-up menu in the VPN section, and e.g. add an IKEv2 setup, it ask me to authenticate, and then provides me with the panel into which to put the relevant settings. I enter some test settings, and then hit the [Create] button... …and nothing! The new VPN configuration doesn’t show up in the list, where it should show up. It’s as if I had done nothing. No matter what I do, the VPN configurations are immutable. I suspect that some folder somewhere is either missing or for some reason has the wrong permissions. Where are these VPN configurations stored? Any other hints on how to fix this? Reinstalling the OS does’t fix this, since this issue persisted across various betas of macOS26

I have received this installation error attempting to upgrade from MacOS 26.4 beta 2 to beta 3 on my Intel 2020 27” iMac, and now trying to install beta 4 from beta 3 on my M1 Max MBP. I have seen from a sprinkling of post that some others have had the same issue. I was able to successfully perform the 2 to 3 upgrade on the iMac in safe boot, suggesting possible compatible, third-party app. But that did not work for beta 4 on either device. I have submitted feedback for each episode. Any others have this issue? Unusual for Apple, I have never had any issues installing beta software before.

This example application crashes when entering any text to the token field with FAULT: NSGenericException: The window has been marked as needing another Update Constraints in Window pass, but it has already had more Update Constraints in Window passes than there are views in the window. The app uses controlTextDidChange to update a live preview where it accesses the objectValue of the token field. If one character is entered, it also looks like the NSTokenFieldDelegate methods tokenField(_:styleForRepresentedObject:) tokenField(_:editingStringForRepresentedObject:) tokenField(_:representedObjectForEditing:) are called more than 10000 times until the example app crashes on macOS Tahoe 26 beta 6. I've reported this issue with beta 1 as FB18088608, but haven't heard back so far. I have multiple occurrences of this issue in my app, which is working fine on previous versions of macOS. I haven't found a workaround yet, and I’m getting anxious of this issue persisting into the official release.

Title says it all, so I get to 5 minutes left, and then the error message 'failed to prepare update' appears. I've done this for about a week now and the same thing happens. Does anyone have any insight to this problem?

In my tabview i set a safeAreaBar topPanel, under i have contentview. That ignore safeArea.top so feed go under. What is the best Way to have a the first post in content appear under (under the bottom) if the safeareabar. I use list with foreach. Do we measure the height or is it some smart tips?

I dutifully upgraded my software (beta) on Feb. 24 when prompted. I could not get the computer to reboot, then after about 5 hours on the phone with, I think, 4 techs, they told me the only solution was to wait for the next update - I could not go backwards to the regular version. So $1,299 later I have a new Mac Mini M4! I have to work, so it was the only solution. What do I win?

I installed the latest build of Tahoe (25E5218f) yesterday on our test machine, an M1 Pro MacBook Pro and have been having a hard time getting my WiFi network to work. It's especially noticeable in Mail and Safari. Mail shows it can't connect to the designated server, and Safari simply can't connect to most sites. None of my other devices or computers are having problems, so I have to assume it's this last build that is the culprit. When I tether to my iPhone Air, everything pops back into place and I can access Mail and use Safari. I've reported the problem with FBA, but wanted to know if anyone else is experiencing the same thing.

In the first Xcode 16 beta, none of my SwiftUI previews work - they all just crash on start up. Has anybody run into this and found a workaround? Have tried all the usual steps of cleaning the project/restarting Xcode.

PLEASE HELP! All of the sudden, today I cannot get onto sites I use normally. Like chat, claude, canva etc. I keep getting this error message. Can someone please tell me is going on? This needs to be fixed!

After updating to another beta of High Sierra, my internal hard drive became read-only somehow. I have a user home directory on that and many things have stopped working. I tried re-installing the OS, but it didn't help. I'm out of options by now. Anyone has ideas how can I fix that?

I've recently installed 26.1 Beta 3 alongside stable 26.0.1 When building my app with 26.0.1 the final .ipa size is ~17mb, however after building my app with 26.1 Beta 3 the size has increased up to ~22mb The main difference is Assets.car blowing from 1.1mb to 5.6mb (or 8.6mb if I include all icons settings). Upon examining I've found new liquid glass .icon file duplicating itself multiple times as png variants (any, dark, tinted, etc). Is anyone else experiencing this issue?

Hello! Because the compilers used by different versions of Xcode 26 may be different, and I find that my app may not be able to ensure that all versions of Xcode 26 are successfully compiled. For example, my app can run on Xcode26.3 but will report an error at 26.4 (I have fixed it now). So I want to confirm which version of Xcode the jury uses to run my app, whether it is a known version or the latest version in the future. Thanks!

FB21772424 On any iPhone or iPad running 26.3 beta 3 with UIFileSharingEnabled enabled via Xcode, a file cannot be manually copied to/from macOS or manually deleted from Finder but 26.3 beta 2 works fine running on any iPhone or iPad. The version of macOS is irrelevant as both macOS 26.2.1 and macOS 26.3 beta 3 are unable to affect file changes via macOS Finder on iPhone or iPad running 26.3 beta 3 but can affect file changes via macOS Finder on iPhone or iPad running 26.2.1 Thank you.

I’m currently developing an application using WKWebView. After updating to iOS 26.2 Developer Beta, the following Web API started returning false: isUserVerifyingPlatformAuthenticatorAvailable MDN: https://developer.mozilla.org/ja/docs/Web/API/PublicKeyCredential/isUserVerifyingPlatformAuthenticatorAvailable_static This issue did not occur on iOS 26.1 — it only happens on the beta version. Has anyone else encountered this problem or is aware of any related changes? OS: iOS 26.2 beta 3 (23C5044b)