Btw it seems that this problems occurs when you have a logitech mouse?
Paul and Amadeo, do you too have a logitech mouse?
Indeed the button does not work. However typing in does as does using ctrl and using the zoom wheel of a mouse.
Unfortunately this zooming-problem still occurs in 7.9.0.
Using any mouse, even using the built in touchpad on laptop (HP).
A few months ago I logged an "idea" about a similar issue. You can find it here:
Please vote this idea :-)