The system menu bar in OS X is usually fully accessible, either by moving your mouse to the top of the screen and clicking on it or by using hotkeys. However, there may be times when that menu bar stops working: It may disappear or stop functioning, items on it may be grayed out or frozen, or your cursor may show the spinning beach-ball when you hover your cursor over a menu bar item. Here's how to troubleshoot the problem when any of those things happen. Frozen menu items Whatever the specific problem, the first thing to do is to check whether the frozen menu is the result of a third-party add-on, such as Dropbox, LittleSnitch, Evernote, or the like. You can determine this by hovering your mouse over each menu item for a few seconds. If only one item produces the spinning color wheel when accessed in this manner, and the others are still functional, you’ve isolated the problem. You can further check this by opening Activity Monitor to see if any hanging processes (highlighted in red text) correspond to the frozen menu item.

If Outlook stops responding at a screen that says 'Processing,' you can close Outlook, start it in safe mode, then close it and open it normally to fix the problem. Close Outlook. Launch Outlook in safe mode by choosing one of the following options.

If you determine the problem is from a single third-party app, then you will have to troubleshoot it. Java runtime environment 1.8.0_144. Sometimes quitting or force-quitting the app will be enough to fix the problem. It's also worth checking to see if an updated version is available. However, if those steps fail to clear the problem, then you will have to dive further into the specific app’s configuration. This may involve removing preference files and caches, or adjusting system settings that might conflict with the application; the specific steps will depend on the app and the services it offers. Your best bet in these situations is to contact the app’s developers and official support channels to troubleshoot the problem.

Built-in status menus (blue) are managed by the SystemUIServer process, whereas third-party menus (red) run independently. Because third-party apps like Dropbox or iStatMenus are separate programs, they tend to hang independently. By contrast, Apple’s status menus (such as the Wi-Fi, Volume, VPN, BlueTooth, Battery, and System Clock) are managed by a central OS X process (SystemUIServer), so they might all freeze at once.

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So if you notice that one or more of these items is producing that spinning color wheel, you can often solve the problem by killing that process. To do so, open the Activity Monitor utility, choose All Processes from the View menu, and then select the SystemUIServer process and click the Force Quit button on the toolbar. Alternatively, you could open the Terminal, enter the command killall SystemUIServer, and press Return. Search for the SystemUIServer process and then click the toolbar button to force-quit it. The process should automatically restart and load your menus again.