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In Windows 7, when alt + Tab ing between windows, some windows are previewed and show their contents. Others appear as an empty white frame with a blank title bar.

When rotating through the windows using windows + tab, the same windows that are blank white with alt-tab are shown as small empty windows with the folder icon in them.

Why are some windows blank white, and what can be done to cause all windows to display their content and title while selecting with alt-tab?

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  • I think it probably depends on the application on whether it renders in the preview.
    – ChrisF
    Commented Sep 26, 2012 at 12:51
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    @tim11g: Please can you give some examples of programs that exhibit this behaviour. Also, is this a new problem or something that has been happening for a while? Have you tried restarting the computer to see if it persists? What specific version of Windows 7 are you using (Basic, Home Premium, etc.)
    – James P
    Commented Sep 26, 2012 at 13:46

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This normally occurs for background processes, which don't actually have a window but is being picked up.

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