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public beta 2's installation fixed this problem; the mountain is back! (just mentioning it). thanx all for ideas...

EDIT: the file restored by the beta is this: "Mojave (Dynamic).heic"; makes sense (and obviously the OS sees it as essential)...
 
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Here is mine, looks great :p
Screen-Shot-2018-07-10-at-15.03.24.png
 
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