Unable to come out of Screen saver using keyboard

[Don MC]

Hi everyone. Since upgrading to HS, I have been unable to come out of Screen Saver using any of the keys on my keyboard. If the Screen Saver is turned of after a set time period, the only way to come out of it is by clicking the external mouse (Logitech). I used to just hit the space key and it would snap out of it, but it will not do so anymore.

Any ideas?

I have a rMBP 15" (Mid 2014), an external wired Apple keyboard, an external display (via TB) and a wireless Logitech mouse (dongle connected to my external keyboard).