Symptoms
On a device running Windows 8.1, if you use a mouse, touchpad, or touchscreen to drag and drop an item to either the upper-left or upper-right corner of the screen, one or more of the following problems may occur:
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There is no response when clicking on the Start button.
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Hovering the mouse pointer over the lower or upper right corner of the desktop does not present the charms menu (Search, Share, Start, Devices, and Settings).
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Hovering the mouse pointer over the upper left corner of the desktop does not present a list of running Microsoft Store apps.
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Hovering the mouse pointer at the top of the screen while in a Microsoft Store app will not present the options to minimize or close the app.
Note: In this scenario, the touch screen or keyboard still work as expected.
Workaround
To work around this issue, choose one of the following methods:
Method #1: Restart the Windows Explorer Process
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Right-click taskbar and select Task Manager.
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Locate and select Windows Explorer in the Processes tab.
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Right-click Windows Explorer and select Restart.
Method #2: Sign out and then sign back into Windows
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Save all data and close any open apps.
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Press the Windows logo key using the touch screen or keyboard.
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Tap or click your account picture in the upper-right corner of the Start screen, and then choose Sign out.
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Once you've signed out, sign in to your PC using the method of your choice.
To prevent this problem from reoccurring, turn off the Corner navigation setting for "When I click the upper-left corner, switch between my recent apps":
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Swipe in from the right edge of the screen, tap Settings, and then tap Change PC settings.(If you're using a mouse, point to the lower-right corner of the screen, move the mouse pointer up, click Settings, and then click Change PC settings.)
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Select PC and Devices and then Corners and edges.
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Under Corner navigation, tap or click the When I click the upper-left corner, switch between my recent apps slider to set it to Off.
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Close PC Settings.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
