Symptoms
Assume that you open two workbooks that have different content in Microsoft Excel 2010. When you press Alt+Tab to switch between the two workbooks, overlapping content is displayed in the main windows of Excel 2010.Note This issue occurs when you run Excel 2010 on a computer that is running Windows 7 and that has the Aero feature enabled.
Workaround
To work around this issue, first turn off the Enable desktop composition option in Windows 7. To do this, follow these steps:
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Click Start, right-click Computer, and then click Properties in the menu.
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Click the Advanced system settings option in the left of the window.
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Under the Advanced tab of System Properties window, click Settings in the Performance group.
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Select the Custom option in the Performance Options window.
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Clear the Enable desktop composition check box.
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Click Apply, and then click OK.
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In the System Properties window, click OK.
After you turn off the Enable desktop composition option, use one of the following methods to avoid the issue:
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Switch between workbooks by pressing Alt+Tab slowly.
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Switch between workbooks by using the Windows 7 taskbar.
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Switch between workbooks by using the Switch Windows button in the View ribbon of Excel 2010.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
