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Windows 7: ALT+TAB not working under Aero Themes sometimes

09 Dec 2016   #1

Windows 7 Ultimate x64
ALT+TAB not working under Aero Themes sometimes

Sometimes my Alt+tab or switching windows by clicking on the taskbar, will stop working. This is fixed by a reboot, and tends to happen after having the computer on for several hours.
The issue means that the only way to switch programs is to drag them to different parts of the screen and actually click on them, or to use Win+Tab (Win+Tab still works, alt+tab does not work).

This issue can be fixed by going to performance options and disabling "Use visual styles on windows and buttons". This issue can also be fixed by killing explorer.exe, the issue resumes a moment after restarting explorer.exe. The issue can also be fixed by going to Personalization and switching to the Windows Classic theme . I believe this is the same issue as Windows focus bug - Alt Key doesn't work to access menus. - Microsoft Community . When using the windows classic theme, clicking on a program on the taskbar still does not work and it must be brought to the front via alt+tab.

All 3 above issues involve not having a taskbar, or having every window in the old windows classic theme. I am looking for the root cause that will allow me to have a windows aero theme enabled and still be able to use alt+tab every time, and not have to reboot the computer every so often.

I have attempted to restart the Desktop windows manager service. I have tried disabling Aero peek and desktop composition. I have tried using the Aero troubleshooter. I have attempted to unplug any headsets/microphones. I have used SFC /scannow and found no issues.
This is not a stuck-key issue because sometimes alt+tab works, alt+windows works and the tab key still works fine (All other hotkeys are fine).

I find this issue very puzzling, does anybody have any suggestions for a solution?

My System SpecsSystem Spec

 ALT+TAB not working under Aero Themes sometimes

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