Whiteout (missing UI graphics) on toolbar icons in Yosemite Getting this weird UI whiteout on all toolbar icons all of a sudden. Any idea how to get rid of this? I have been using this version of OS X for a while with no problems at all.
Restart into Safe Mode by holding Shift on boot, then log in, then reboot normally. This clears any broken caches.

Also try disabling TotalFinder and other Finder extensions if the problem persists.