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BriefCam Troubleshooting Guide

Why does the license activation tool appear with a blank UI?

Last Updated: 1 minute read
Version2024r2
LanguageEnglish

Sometimes a .NET app doesn’t load properly and instead it displays a blank window rather than the full graphic view (see sample below) and stops responding. This is called a Blank WPF window.

This is related to the graphic HW acceleration settings, or the current driver installed.

License activation blank.png

To resolve this issue:

  1. Check if the VGA cable is connected to the GPU card output rather than the built-in VGA connector.

  2. Check if the current driver is up to date.

  3. Once you carried out steps 1 and 2, disable the HW acceleration via the registry:

    1. Open regedit.

    2. Go to the following path: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Avalon.Graphics.

    3. On the right-hand window look for the word key DisableHWAcceleration.

    4. If the word key does not exist, create one by right-clicking and choosing String Value.

      Registry Editor string value.png

    5. Name the new key DisableHWAcceleration.

    6. Set the value to 1.

      Registry Editor DisableHW.png

  4. Close and reopen the desired .NET application.