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