The problem is when, for some reason, I accidentally Right-Alt Right-clicked an icon in the taskbar. And that causes to freeze the highlighting on any icon that is selected from the taskbar. I managed to solve this by:
1* Right-click an icon on the taskbar. (nothing will happen, except that icon highlight sticks). 2* Press the WIN-Key. (opens the Start menu + the context menu for the previously Right-clicked icon).
This problem is not new to me as it occurs when I was using [Windows 7 + Windows 8.1], and Found a solution that worked with the both OSs: (Shift-Right Click). But in Windows 10 that is no more applicable. I don't know but I think Microsoft is keeping this bug as an evil-eye protection, this is the 4th OS upgrade and the bug still exists.
I can't find any solution for this in the internet pages. Any help is highly appreciate it because this thing is really frustrating.