I've reset controls config to default - nothing.

My keyboard model is 'Apple MB110 Wired Keyboard'.

Maybe it's not a keyboard issue?

It is not working when bound to the "Optics Mode" action.

Screen:
https://www.dropbox.com/s/w98koxdetoql1pr/arma3%202014-07-07%2023-09-27-852.png

Video:
http://www.youtube.com/watch?v=EgIJp52ylzY&feature=youtu.be

I did. It doesn't work for me.