Function keys row has stopped working after update 10.11.6

I upgraded my Macbook Pro to El Capitan 10.11.6 last week, and the row function keys have now stopped working.  If someone has had this problem and how can it be solved?

Thanks in advance for your help (I'm not very tech savvy, so please, responses may be simplistic?)

The keys work when starting recovery?

On OS X Recovery - Apple Support

This is the Office Mac Pro forum. I asked that your post moved to the forum of laptop MacBook Pro or another appropriate forum.

Tags: Notebooks

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