Why is there a yellow bar over the Finder icon

dockfindergraphicsicon

I have a Mac running OS X El Capitan (10.11.3), and I just noticed this today:

Weird Finder Icon

I haven't installed anything new, and I have no reason to believe that there's a specific application responsible for this issue. I rebooted my Mac, cleared the NVRAM and ran CleanMyMac 3, but it's still there. Killing the dock or restarting SystemUIServer doesn't help.

Question: Why is there a yellow bar over my Finder icon?

Best Answer

It's a corrupt icon cache. It can be fixed by running the following code from fabiofl:

sudo find /private/var/folders/ -name com.apple.dock.iconcache -exec rm {} \;
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