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Windows screen display shows black areas and suffers from delays

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Over a period of time without a reboot, the screen display becomes sluggish to respond and contains patches of black and can become distorted until a reboot is performed



The Graphics Device Interface (GDI) is a core operating system component responsible for representing graphical objects on the screen display including the user interface of Webroot SecureAnywhere. Each running program that needs to show something on the screen consumes GDI objects.  


Although not proven, our current research leads to believe that there are circumstances in which Webroot SecureAnywhere does not release GDI objects when it has finished with them.  When too many are in used, Windows is unable to draw any more GDI objects, leading to misbehaving software and frozen and unresponsive program operation.  


For more information on Windows GDI, see this article :  Graphics Device Interface



Webroot SecureAnywhere



All versions of Windows, including server editions




  1. This issue can be partially worked around by disabling Webroot SecureAnywhere UI elements which reduces the consumption of GDI resources.  This can be performed on a device or in policy
  • Show a SecureAnywhere shortcut on the desktop = OFF
  • Show a system tray icon = OFF
  • Show a splash screen on bootup = OFF  
  1. Disabling AERO Themes has also been reported to reduce the occurrence of this issue
  1. The number of GDI objects available per process can be increased by creating a registry key.
  • Using regedit, browse to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows
  • Create a DWORD and name it GDIProcessHandleQuota
  • Start with a value of 16,384
  • Reboot the computer

GDIProcessHandleQuota can have a max value of 65,536.  Gradually increase towards this number if problems persist.





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