On a Bluetooth-connected Magic Trackpad, the three-finger swipe for Mission Control intermittently stops responding. Candidate causes and a diagnostic sequence to tell them apart. Confirmed on macOS 26.1 (Tahoe, as of 2026-09).
On a Bluetooth-connected Magic Trackpad, swiping up with three fingers to open Mission Control intermittently stops responding. Clicking, scrolling, and two-finger gestures keep working the whole time. Opening System Settings > Trackpad makes the gesture work again immediately.
This reproduced identically on two separate Macs. Both use a Bluetooth Magic Trackpad, and neither uses Universal Control. That rules out a single device's misconfiguration — this looks like an issue in the macOS + Magic Trackpad (Bluetooth) combination itself.
Apple has not published an official explanation. This is an unresolved bug that has persisted from macOS Monterey through Tahoe (26.1, as of 2026-09). Community reports point to two overlapping causes.
Dock process, which handles gesture recognition, intermittently loses its gesture-recognition state. Built-in trackpad users report the same symptom, so this cause is independent of trackpad type.TPTransportSwitch). At the moment of that switch, Dock fails to re-subscribe to the new multitouch session. This is reported disproportionately by wireless Magic Trackpad users.Opening System Settings > Trackpad fixes it because that panel forces a fresh multitouch session to draw its live preview.
On this Mac, Karabiner-Elements — the same tool used for setting up ESC to English — was an early suspect, since it accesses HID devices with root privileges. Checking ~/.config/karabiner/karabiner.json ruled it out: only two keyboards are registered, with no rules for the trackpad or any pointing device.
When the symptom appears, try the following steps in order before opening System Settings. Which step fixes it tells you the cause.
killall Dock in Terminal. Dock restarts automatically and window layout is preserved. If this fixes it, the cause is the Dock recognizer.System Settings > Trackpad fixes it, that panel's live-preview re-subscription is a separate path.Commands used to check the macOS environment and the Bluetooth trackpad's state.
# Check trackpad battery and transport mode
ioreg -c AppleDeviceManagementHIDEventService -r -l | grep -iE "Product|BatteryPercent|Transport"
# Bluetooth connection details (HID ACL vs BLE)
system_profiler SPBluetoothDataType | grep -iB3 -A15 "Magic Trackpad"
# Live log capture — start this before opening System Settings when the symptom appears
log stream --style compact --predicate 'process IN {"Dock","WindowServer","bluetoothd"} OR eventMessage CONTAINS[c] "multitouch" OR eventMessage CONTAINS[c] "TPTransportSwitch" OR eventMessage CONTAINS[c] "MissionControl"'
| Fix | Points to | Notes |
|---|---|---|
killall Dock |
Dock recognizer |
Applies immediately, no logout needed; window layout is preserved |
| Disconnect/reconnect Bluetooth | Trackpad session | Available directly from the Bluetooth menu bar icon |
| Log out and back in | Dock recognizer (stronger form) |
Use when killall Dock doesn't fix it |
| Remove the trackpad from Bluetooth and re-pair | Trackpad session (longer-term) | Many users report fewer recurrences afterward |
| Turn off Universal Control | Separate cause | Only suspect this if you link multiple Macs with Universal Control. Ruled out here since Universal Control isn't in use |
Apple has not officially acknowledged this. It has been reported continuously from macOS Monterey through Tahoe (26.1, as of 2026-09).