Blurry window and text

@WhiteNoise @rigmarole Thank you for your help. I found the root cause.

Using a Retina display - Apple Support helped. As it turns out, “Open in Low Resolution” was selected in Get Info panel.

This is the solution from the support page:

  1. Quit the app.
  2. Open the Applications folder.
  3. Click the app once to select it, then choose Get Info from the File menu.
  4. From the Get Info window that opens, select the checkbox labeled ”Open in Low Resolution.”
  5. Close the Get Info window and open the app again.
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