Control button does not work after the opening of Messages

When I open the application Message, command suddenly stops working. I can't command-tab to switch applications, for example. This happens everytime I open messages; It is clearly linked.

I'm under 10.11.6 on MacBook Pro (retina, 15 inch, mid-2015).

Hello crabman230,

Welcome to Apple Support communities.

I see that when you open the messaging app, you can not command + Tab to change the applications. This only happens when the Messages app is open. I understand how difficult it can be for a feature works not when a specific application is open, and I imagine that you are probably ready to get this resolved. I have a few things I want to try.

First, let's go ahead and give a fresh restart your MacBook Pro. Go to the Apple menu > restart. A time you've restarted, open the messaging app and test the command + Tab to see if you get the same result.

Then, restart your computer in safe mode. Safe mode (sometimes called secure boot) is a way to start up your Mac so that it performs certain checks and prevents certain software from loading automatically or opening. Once you're in safe mode, open the messaging app and test new command + Tab. The following article will help you start in safe mode:

OS X El Capitan: start in safe mode

Finally, if you still continue to have a problem, create a new user and test again. In a new user test can help circumvent the problem of the current user to the system. This article will help you:

OS X El Capitan: set up users on your Mac.

See you soon!

Tags: Mac OS & System Software

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