Taskbar gone dingy

#1
I have Windows 8.1 Pro and I have a problem with the taskbar. Sometimes, maybe about a quarter of the time, when I click on a taskbar button to switch to whatever program I get a system 'ding' and nothing happens. If I click the same spot right afterwards it works normally, and it does not happen every time. The second click is not a big deal, but it's annoying when the computer just fails randomly on such a simple request.
 


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