The Function (fn) key keeps bringing up Mission Control. How do I disable it?
I was able to replicate the problem. Here's what worked on my machine to fix it:


Go to System Preferences » Mission Control
Under Keyboard and Mouse Shortcuts, go to Mission Control.

If it's set to fn, set it to some other value (or the - at the bottom of the list to disable a keyboard shortcut for Mission Control).
If it's not set for fn, but fn keeps triggering it (which happened to me), change it to anything else, then change it back to the value you want it to have.



On my machine, that made fn stop triggering Mission Control.