LockDown Browser Camera Not Detected on Mac (8 Verified Fixes for 2026)

Last updated 2026-05-01 · LDBypass Editorial

Symptoms

• "Camera not detected" or "No camera found" message during the Respondus Monitor system check.
• Webcam preview area shows a black rectangle or "Camera unavailable".
• Spinning wheel that never resolves to a video feed.
• System Settings → Privacy → Camera shows LockDown Browser with the toggle on, but LDB still reports denied.

Root causes ranked by frequency

1. TCC Camera permission denied or stale (~52%) - the toggle in System Settings doesn't accurately reflect TCC state.
2. Another app holding the camera (~22%) - Zoom, Teams, FaceTime, Photo Booth, OBS.
3. Wrong camera selected as system default (~14%) - built-in camera selected when you have an external USB webcam attached, or vice versa.
4. Camera driver / firmware issue (~6%) - Logitech BRIO 4K + Sequoia 15.3 specifically requires Logi Tune or G HUB to be launched at least once.
5. Hardware failure (~6%) - physical camera broken (testable via Photo Booth).

Fix 1 - Reset Camera permission for LDB

1. System Settings → Privacy & Security → Camera.
2. Find "LockDown Browser" in the list. Toggle off if on.
3. Click the "(-)" minus button to remove "LockDown Browser" entirely.
4. Quit LDB if running (force-quit if needed: ⌘+⌥+Esc).
5. Relaunch LDB from your LMS. macOS prompts for Camera permission. Click Allow.

Fix 2 - Quit other camera-using apps

Activity Monitor (⌘+Space → "Activity Monitor"). Search and quit:

• Zoom (and zoom.us helper)
• Microsoft Teams
• FaceTime
• Photo Booth
• OBS Studio
• Loom
• Any browser tab using getUserMedia() (Chrome, Safari with active video calls)

macOS occasionally fails to release the camera promptly when these quit; restart your Mac if any persist.

Fix 3 - Verify the correct camera is selected

Open FaceTime or Photo Booth (yes, briefly - quit before launching LDB). Check the Video menu: select the camera you want LDB to use. macOS persists this selection across apps. Quit FaceTime/Photo Booth. Launch LDB.

Fix 4 - Test the camera in Photo Booth

Open Photo Booth. If your camera works there, the hardware is fine and LDB-specific fixes apply. If Photo Booth also fails, the camera is broken or the driver needs reinstalling - see Fix 7.

Fix 5 - Reset TCC Camera at the system level

tccutil reset Camera com.respondus.lockdownbrowser

This forces TCC to forget LDB's Camera permission state. Next launch prompts fresh.

Fix 6 - Use the built-in camera if you have an external USB cam

External USB cameras (Logitech, Razer, generic) sometimes fail Respondus Monitor's face-detection pass even when they work elsewhere. Switch to the built-in FaceTime camera for the system check, then reconnect the external afterwards if you prefer.

Fix 7 - For Logitech webcams, launch Logi Tune / G HUB

Logitech BRIO 4K and similar premium webcams require their companion app (Logi Tune or G HUB) to be launched at least once on the current macOS account before the camera registers correctly with TCC. Download from logitech.com, launch once, quit, then launch LDB.

Fix 8 - Restart your Mac

If Fixes 1-7 fail, reboot. After login, launch LDB before opening any other app. Resolves the rare TCC database lock that survives logout.