After the last two betas of 10.13.3 (beta 3 & 4) I've had problems with app icons reverting to generic. With beta 3 I was able to simply rebuild the launch services db and this corrected the problem. Attempted the same fix after beta 4 w/o any success. Odd thing is that when you look in the Applications folder, the icons are there and correct, but icons in the dock or when you Get Info and look in the preview box, are not.
Ideas on how to correct?
I had the same problem, too (10.13.3 beta 4).
I noticed there was a problem when I started to receive Telegram notifications with the generic app icon. When I look at the Applications folder, many app were missing the correct icon, so I restarted the Mac. After the reboot, all the apps regained the correct icon in the Applications folder (view as Column), in the Get Info window and in the Dock, except for Telegram.app that lost its icon in the Dock and in the Get Info window. To fix this I simply uninstalled and reinstalled Telegram from the MAS… but there should be a better way for sure.
Did you try to install Beta 5 to verify if it fixes this issue?
