A blank screen, a spinning webcam check, or a launch button that does nothing — LockDown Browser failures have a knack for striking just as the exam timer starts ticking. But the fix is rarely an uninstall-and-reinstall panic; it’s a methodical check of device compatibility, installation source, and LMS launch path, according to a new troubleshooting guide compiled from Respondus support documentation and updated for mid-2026.

Where LockDown Browser Trips Up

LockDown Browser’s secure exam environment works by locking down the computer — blocking other apps, restricting screen sharing, and monitoring the webcam. When you see an error, it’s usually because something on your system conflicts with that lockdown. The four most common culprits: an unsupported device or OS, an installer tied to the wrong school, a forgotten app running in the background, or a webcam and microphone that the browser can’t access. None of these require deep technical skills to fix, but you do need to follow the right sequence.

Start with Device Support — Before Touching Anything Else

If your computer or tablet isn’t on the compatibility list, no amount of reinstalling will make the exam work. As of July 2026, Respondus requires:

  • Windows: Windows 11 or Windows 10 version 10.0.19045 (build 19045) or later. Windows S mode, Windows SE, and ARM‑based Windows are not supported.
  • macOS: macOS 12 (Monterey) or later.
  • Chromebook: ChromeOS on the Long Term Support channel; Stable channel is recommended.
  • iPad: iPadOS 15 or later on an iPad. The instructor must also permit iPad use if the exam uses Respondus Monitor.

A computer that will use a webcam for Respondus Monitor needs at least 4 GB of available RAM. Disconnect any extra monitors before testing — a second display can cause a blank exam screen. If your device falls outside these boundaries, borrow a supported one from your school’s loaner program or a campus lab.

The Institution Installer Trap (and How to Escape It)

The LockDown Browser installer you download is stamped with your school’s identity. Grab it from a generic download site, and you’ll land on another institution’s login page — or get a “browser not correctly configured” message. Uninstall any existing copy, then get the correct link from your instructor, your campus IT desk, or the exam page inside your LMS. The URL will follow this pattern: https://download.respondus.com/lockdown/download.php?id=xxxxxxxxx (the nine‑digit number is your school’s unique Institution ID). Run the installer while signed in as a local administrator. After installation, open LockDown Browser, click the information (i) button on the toolbar (the Globe icon on Mac), and choose Check for Update. If the in‑app update fails, download the full installer again from your school’s link — it can repair, modify, or reinstall an existing installation.

The Exam Launch Sequence That LMS Hides

For most learning systems, you don’t open LockDown Browser first. Instead, you log in to your LMS in Chrome, Edge, Firefox, or Safari, navigate to the exam page, and click the Launch LockDown Browser button. Approve the prompt that asks to open the browser, and — if offered — choose the option to remember the choice. A common trap: clicking “Don’t Open” and saving that preference makes the button appear dead.

Canvas Classic Quizzes and Blackboard Learn Original work differently on Windows and Mac. There, you open the LockDown Browser desktop app, sign in to your LMS inside it, and then open the exam. If the launch button still does nothing, reset your main browser’s protocol associations: in Chrome, open Settings, search for “reset,” and restore settings to their original defaults; in Firefox, open Settings > Applications, find the RLDB content type, and set it to open with LockDown Browser.

Camera and Mic Refuse to Cooperate? Here’s the Permission Checklist

An endless spinning wheel during the webcam check usually means another app is holding the camera, or the operating system hasn’t given permission. First, exit the check and update LockDown Browser. Then restart your computer and close everything that can touch a camera or microphone — Zoom, Teams, Discord, OBS, browser tabs, camera utilities, and any virtual‑camera or filter software.

On Windows 11, head to:
- Settings > Privacy & security > Camera: turn on Camera access, Let apps access your camera, and Let desktop apps access your camera.
- Settings > Privacy & security > Microphone: turn on the three matching toggles.
- Settings > System > Sound: verify the intended microphone is detected and enabled under Input.

On macOS 13 or newer, open System Settings > Privacy & Security > Camera, then enable LockDown Browser. Repeat under Microphone. On older macOS versions, the toggles live in System Preferences > Security & Privacy > Privacy.

During the webcam check itself, click Change my webcam and pick the actual built‑in or USB camera — never an entry labeled “virtual,” “filter,” or “splitter.” If the check still fails, click It’s not working to launch the built‑in troubleshooter.

Banished Apps: Why LockDown Browser Blocks Your Tools

LockDown Browser deliberately stops a long list of applications from running during an exam. Screen recording, screen‑sharing, remote‑desktop, messaging apps, virtual machines, network‑monitoring tools, and webcam filters are all on the hit list. Save your work, quit unnecessary programs, and restart the computer before you launch the exam. If LockDown Browser offers to close a blocked program, let it. A persistent warning often means a background process is still alive — open Task Manager on Windows or Activity Monitor on macOS to kill it manually.

Recovering When the Screen Goes Blank or the Connection Drops

A blank exam page normally signals that LockDown Browser can’t talk to your school’s LMS. Check that your normal internet connection works, then restart the computer and move closer to the router or switch to a wired connection. Before you re‑enter the exam:

  • Disconnect any additional monitors.
  • Turn off VPN, proxy, and Tor connections (unless your institution requires them).
  • Set the computer’s date, time, and time zone to match your physical location.
  • Restart your router if other devices are also struggling.

If you’re on a managed campus or corporate network, the network admin may need to allow access to *.amazonaws.com, *.respondus.com, *.respondus2.com, *.cloudfront.net, and *.knowledgeowl.com over port 443 with TLS 1.2 or newer. Student‑side firewall or security software can also block LockDown Browser — try temporarily allowing the program through your local firewall.

Chromebook and iPad: The Device‑Specific Gotchas

Chromebook: Make sure the LockDown Browser Chrome Extension is installed and turned on. Check chrome://extensions/. If you see “session not active” errors, clear all cookies and site data (chrome://settings/clearBrowserData, set Time range to All time), then go to chrome://settings/siteData and click Remove All. For D2L Brightspace, allow pop‑ups and redirects for your school’s Brightspace URL. When asked to share your screen, select Entire Screen, click the thumbnail to highlight it, then click Share.

iPad: Download the LockDown Browser app from the Apple App Store. Whether you can use it depends on your instructor’s settings. For Blackboard Original and Canvas Classic Quizzes, open the LockDown Browser app first. For Brightspace, Moodle, Blackboard Ultra, Canvas New Quizzes, Schoology, and ALEKS, start in Safari or Chrome and approve the prompt to open LockDown Browser. The Canvas Student iPad app won’t work for a LockDown Browser exam. If the iPad says the instructor hasn’t enabled tablet use, switch to a Windows or Mac computer.

Red Flags That Mean Campus IT Must Step In

Some errors are beyond a student’s control. If you see any of these, contact your instructor or help desk immediately — preferably before the exam window closes:

  • Invalid Profile
  • There is a problem with the URL for this exam
  • There is a problem with the LockDown Browser settings for this exam
  • A message that an otherwise supported Chromebook or iPad is not allowed
  • A webcam‑required warning that doesn’t match the exam’s Respondus Monitor settings
  • An external course resource that is supposed to open during the exam but is blocked

Instructors must correct these in the LockDown Browser Dashboard, and campus IT may need to adjust profile, network, or single‑sign‑on configurations. Students can’t fix LMS integrations, Server‑side settings, or Respondus Monitor requirements.

Outlook

As online proctoring tools grow more stringent, LockDown Browser will likely tighten its app‑blocking rules and version enforcement. A pre‑exam dry run remains your best insurance: a day before the test, launch the browser from your LMS, run the system and webcam checks inside the Help Center, and confirm your institution’s installer is the one on your desktop. Those ten minutes can spare you a call to the help desk while the clock is ticking.