Troubleshooting Safe Exam Browser: How to Fix the Most Common SEB Problems

Safe Exam Browser is robust and reliable when properly configured — but like all software, it can sometimes run into issues. Whether SEB is not opening, displaying a black screen, refusing to load the exam URL, or conflicting with your operating system, this troubleshooting guide provides clear, step-by-step fixes for the most common problems encountered on Windows and macOS.

Before working through specific issues, keep in mind that the majority of SEB problems fall into three categories: installation errors, configuration mismatches, and software conflicts. Identifying which category your issue belongs to will help you resolve it faster.

SEB Will Not Open or Launch

If Safe Exam Browser does not open at all after double-clicking the icon or the configuration file, try the following steps in order:

Black Screen on Startup

A black screen when SEB launches — where the application appears to open but displays nothing — is one of the most commonly reported issues. The main causes are:

• GPU driver incompatibility with SEB's rendering engine
• Display scaling set above 100% in Windows settings
• Hardware acceleration conflicts on systems with integrated and dedicated graphics
• Monitor refresh rate set too high

Fixes for Black Screen

1. Go to Windows Display Settings and temporarily set scaling to 100%.
2. Open SEB Preferences (before launching an exam) and disable hardware acceleration under the Browser tab.
3. Update your GPU drivers through Device Manager or your graphics card manufacturer's software.
4. If using a laptop with dual graphics, set SEB to use the integrated GPU via the graphics control panel.
5. Try connecting an external monitor and setting it as the primary display.

SEB Loads but Cannot Access the Exam URL

In this scenario, SEB opens and the browser window appears, but the exam website either does not load or shows a connection error. This is almost always a network or URL-filtering issue.

Configuration File Errors

If SEB displays an error when you open a .seb configuration file, the issue is usually one of the following:

• The configuration file was created for a different version of SEB than the one installed
• The file was corrupted during download or email transfer
• The file is password-protected and the correct password was not entered
• Your SEB installation is outdated and does not support newer configuration parameters

Always request a fresh configuration file directly from your instructor rather than using a forwarded or previously downloaded copy. Configuration files can expire or be regenerated with updated exam settings.

SEB Freezes or Becomes Unresponsive

SEB freezing mid-exam is stressful but manageable if you stay calm and follow the right procedure:

1. Wait at least 60 seconds — SEB may be loading a large exam resource in the background.
2. If still frozen, contact your invigilator or IT support immediately. Do not quit SEB on your own.
3. If authorized to restart, use the SEB quit password to close the application, then relaunch using the same configuration file or exam link.
4. If the issue recurs, it may be caused by insufficient RAM. SEB recommends at least 4 GB — close all other applications before launching.

Antivirus and Firewall Conflicts

Third-party antivirus software is one of the most common causes of SEB conflicts. Some security suites classify SEB's system-level access as suspicious behavior and block it. Known conflicting software categories include:

• Endpoint protection suites with real-time process monitoring
• Corporate firewalls that filter HTTPS traffic
• VPN clients that reroute or inspect web traffic
• Browser protection extensions (though SEB uses its own browser, some system-level extensions interfere)

To resolve antivirus conflicts, temporarily disable real-time protection, add SEB to the whitelist or exclusion list in your security software, and re-test. Remember to re-enable your antivirus after the exam.

macOS-Specific Issues

Gatekeeper Blocking SEB

If macOS displays a message saying SEB cannot be opened because it is from an unidentified developer, follow these steps:

1. Open System Preferences and go to Security & Privacy.
2. Click the lock icon and enter your administrator password.
3. Click Open Anyway next to the SEB warning.
4. Confirm by clicking Open in the dialog that appears.

SEB and macOS Accessibility Permissions

SEB requires Accessibility permissions on macOS to lock the system environment during exams. If you experience issues with keyboard shortcuts not being blocked or the Dock remaining visible, go to System Preferences > Security & Privacy > Accessibility and ensure Safe Exam Browser is checked in the list.

macOS Ventura and Sonoma Compatibility

If you are running a recent macOS version and experiencing startup crashes, ensure you have SEB 3.4 or later installed. Earlier versions have known incompatibilities with macOS Ventura (13) and Sonoma (14). Download the latest version from the download page.

Windows-Specific Issues

SEB and Windows Defender

Windows Defender SmartScreen may display a warning when running the SEB installer for the first time. Click More info and then Run anyway to proceed. The SEB installer is virus-free and verified — this warning appears because SmartScreen checks software reputation by download volume.

Group Policy Conflicts on Managed Machines

On institution-managed Windows computers, Group Policy settings may prevent SEB from functioning correctly. Common symptoms include SEB failing to block Task Manager or Windows key shortcuts. Contact your IT department to whitelist SEB in the Group Policy configuration.

Windows 11 Compatibility

SEB 3.8.0 and later versions are fully compatible with Windows 11. If you are using an older version on Windows 11, certain features such as virtual desktop locking may not work as expected. Update to the latest version to resolve this.

When to Reinstall SEB

If you have worked through the troubleshooting steps above and the problem persists, a clean reinstall is the most effective next step. Perform a clean reinstall as follows:

1. On Windows: Go to Settings > Apps, find Safe Exam Browser, and click Uninstall. Then delete any remaining files from C:\Program Files\SafeExamBrowser.
2. On macOS: Drag Safe Exam Browser from Applications to Trash, then also delete the preferences file at ~/Library/Preferences/org.safeexambrowser.SafeExamBrowser.plist.
3. Restart your computer.
4. Download the latest version from the Download page and install fresh.