Most program icons look the same after high sierra update
After an update to high sierra most program icons look the same.
Any ideas how to fix that?
Solution 1:
Do you have League of Legends installed on your Mac ? It seems to be the cause of the issue for many other mac players.
https://boards.na.leagueoflegends.com/en/c/bug-report/rA0p1rYx-client-updating-on-mac-high-sierra-messes-up-other-application-icons
Unfortunately there is nothing you can do until Riot acknowledged the problem and deploy a fix.