"show desktop" with "hot corners" not working!

I was able to solve the problem by brute force.

Moving every single option in CompizConfig Settings Manager I did find that when Unity was disabled then Show Desktop works as expected with the HOT CORNERS.

So i click every single checkmark in Ubuntu Unity Plugin to finally find that Show Live Previews of Windows in the Switcher was the one to blame. (After unchecking it hot corners works as expected.

A temporary solution until the bug has been fixed, could be to use xdotool.

install:
```
sudo apt-get install xdotool
```
in compiz config manager, under General Settings, insert a command line
```
xdotool key super+d
```
in edge bindings, configure the hot corner

Works for me. Ubuntu 14.04

Open CompizConfig Settings Manager
Under CATEGORY choose Desktop
You will see "Ubuntu Unity Plugin"
On the rightmost tab called "Switcher" uncheck SHOW LIVE PREVIEWS OF WINDOWS IN THE SWITCHER as Ivanyosan suggests above

Ubuntu 14.04 is currently still in development - it will not be available properly until April 2014. You don't need to upgrade to it yet :-).

Anyway, using unity-tweak-tool, set this...

enter image description here ..and you should be able to show & hide the desktop by placing the mouse in the lower-right corner - it works very nicely in 13.10.