Strange shadows on the Sierra of the Mac OS on an external monitor

After upgrading to Mac OS Sierra, I noticed that there are these strange shadows. It of almost like the gradient of a shadow is not fluid and smooth:

Screenshots:

https://www.dropbox.com/s/dj6g3x68c9ggwez/screenshot%202016-09-24%2008.34.42.PNG? DL = 0

https://www.dropbox.com/s/2ql2prnhn2k27rz/screenshot%202016-09-24%2008.35.43.PNG? DL = 0

Is this normal, or is there a problem? Recommend a fix?

I'm on Mac mini (mid-2011) and a screen LCD Dell UltraSharp U2913WM 29 inches.

... However, if the screenshots are picking up, it seems less like a problem of monitor and more like an incompatibility of graphics cards with MacOS Sierra?

This seems to be quite normal. The windows are translucent, and what I see, this is the result of the image behind the window.

It was the same thing in El Capitan (and, I suppose, Yosemite, as well).

You can go to system preferences - > accessibility-> display and select "reduce transparency" if it bothers you.

Tags: Mac OS & System Software

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