Issues With macOS Tahoe beta

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Guillaume Louel edited this page Jul 28, 2025 · 1 revision

Known Issues with macOS Tahoe (macOS 26) Screen Savers

Last updated: July 28, 2025

This document tracks known issues with screen savers on macOS 26 (Tahoe) based on community reports and testing.

UI/UX Changes

Screen Saver Settings Redesign

Issue: Screen Saver pane removed from System Settings, now in a modal dialog within Wallpaper settings
Impact: Smaller, non-resizable preview window, less convenient access
Workaround: None - UI change is intentional
Status: Permanent change ? Reported to Apple as FB18698083

Core Functionality Issues

Dual Instance Launch Bug (FB18697726)

Issue: System Settings launches two legacyScreensaver instances simultaneously (legacyScreenSaver (Wallpaper) and (Wallpaper (System Settings)))
Details:
- One fullscreen instance on main monitor
- Second instance with isPreview=true but frame 0,0,0,0
Impact: Rendering conflicts, preview issues
Workaround: None identified
Status: Reported to Apple as FB18697726

Multi-Monitor Screen Saver Failures

Issue: Screen savers invisible or non-functional on secondary monitors
Details: Not 100%, may happen more with 2 different screen savers set on different monitors. May counteract previously existing attempts to fix previous multimonitor bugs.
Impact: Blank screens on secondary displays
Workaround: None identified
Status: Under investigation

Exit/Restart Mechanism Broken

Issue: Screen saver instances don't properly exit, causing instance stacking
Details: Previous exit(0) workarounds no longer effective
Impact: Resource waste, unpredictable behavior
Workaround: Force quit legacyScreenSaver (Wallpaper) process
Status: Workaround implemented in this template by delaying

isPreview Parameter Unreliable

Issue: isPreview detection broken, opposite behavior from previous versions
Details: Framework provides incorrect preview state
Impact: Cannot reliably determine preview vs fullscreen mode
Workaround: Frame size detection (unreliable)
Status: No reliable workaround available

Development Impact

Legacy Workarounds Ineffective

Issue: Existing workarounds from previous macOS versions no longer work
Impact: Developers must find new solutions for each Tahoe-specific bug
Status: Ongoing adaptation required

Animation Lifecycle Issues

Issue: Multiple startAnimation() calls without corresponding stopAnimation()
Details: Framework may call start multiple times, leading to resource leaks
Impact: Timer leaks, unpredictable behavior
Workaround: State tracking implemented in this template
Status: Defensive programming approach adopted

Template Adaptations

This ScreenSaverMinimal template includes several adaptations for Tahoe issues:

Instance Tracking: Comprehensive logging to identify multi-instance scenarios
Animation State Management: Prevents multiple timer creation from duplicate start calls
Process Identification: Logs help distinguish between different hosting processes
Exit Fix: Implements timed exit for the broken restart mechanism

References