Microsoft has issued a patch to correct an issue in Windows that prevents the thumbnail controls for some programs from displaying on the taskbar.
What this update does:
This patch from Microsoft updates several Windows files.
This update applies to you if: you're running Windows 7 or Windows Server 2008 R2.
More Information:
This update does not correct a widespread or serious security related issue. However, you should install this update to keep any current or future software you use from experiencing this problem.
Both 32-bit and 64-bit versions of the above Windows operating systems are affected.
You may be asked to restart your computer after installing this update.
Automatically install: via Windows Update.
Manually install: via the download link for your operating system here.
Details from Microsoft: Knowledge Base Article 2259539
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