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1) Left Click disabled on Start Menu and any MS core applications on the Taskbar including Skype, Action Center, Defender, Date/Time and Internet Explorer.

2) Right Click disabled on any and all opened Taskbar program icons but not Start Menu, Defender, Date/Time and Action Center.

3) Right Click Menu would pop up on Start Menu, Defender and Action Center. Only Start Menu options were functioning though.  Defender window would open then immediately close. Nothing happened when selecting anything in Action Center menu.

4) Anything that required UAC to execute failed to open any interactive window or installation process.

Rolling back update remedied every issue. MS support explained the issue was not with changes made in their mandatory update but with hardware/outdated drivers that worked perfectly fine with 1709 yesterday.

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woody