Icons not appearing on High Sierra I updated to High Sierra on my Macbook Pro when it was released.
Since I have updated, a lot of my applications show the attached icon when I open them.
Does anyone know a fix to this?
Give this a try. 

sudo find /private/var/folders/ -name com.apple.iconservices -exec rm -rf {} \;
sudo rm -rf /Library/Caches/com.apple.iconservices.store
killall Dock


After running the commands, I had to remove the app from the dock and add it again. It worked for me but YMMV.