Fixed Yosemite flickering icons on menu toolbars. The only solution that worked for me. Solved [duplicate]

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• Prevent redraw of menu bar icons Yosemite 4 answers

I have been struggling for a bit with the flickering of icons (dropbox, battery, wi-fi, time, etc) on the menu bar (top-right corner of the screen) with Yosemite.

I've tried all the hardware resets, toggling reducing transparency, displays have separate spaces, enabling dark menu bar, etc.

I've also followed the thread at Prevent redraw of menu bar icons Yosemite, but Nothing had worked.

After a few long calls with Apple senior engineers, we have now fixed it. The fix is to go on /Library and delete the contents of LaunchAgents, LaunchDaemons, Caches.