I have some interested phenomenoms at the application windows on my Mac.
At some windows the upper corners (left and right) are rectangular (the lower corners are rounded).
Sometimes have the upper corners semi-translucent corners.
At other windows the background color of the window titles are darker or lighter than the rest of the window background.
I re-installed some infected applications, but no change in appearance.
Applications like Safari or Finder can not be installed.
How can I change it to default?
Thanks for a hint.
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