A while ago I started encountering a strange effect on my laptop. Every once in a while, all menu bar icons disappeared. Only the Spotlight icon was left, the rest of my menu bar was grey. Turns out that a part of OSX called SystemUIServer.app is responsible for displaying the stuff in the menu bar.
To get your menu bar icons back, it may help to restart SystemUIServer by doubleclicking it in /System/Library/CoreServices or copy and paste the following command into a Terminal window:
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open /System/Library/CoreServices/SystemUIServer.app
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Hope this works out for you, feel free to leave a comment!
