Fix: Mac Menu Bar Icons Missing
If your Menu Bar icons in Mac X Yosemite suddenly start to disappear, you may have a corrupt System UI Server preferences file. Delete the file and reboot following these steps.
1. Open Mac X Terminal
3. Reboot your Mac.
Your menu bar icons should show up again and you rebuild the menu bar preferences file.
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This was not helping. Menu bar icons shortly show, and then all disappear. Any ideas?