How to fast set hot corners in Mavericks? I used a downloaded applescript to fast enable/disable hot corners but they don't work after I upgrade to Mavericks. Someone knows what's happening?

Here's the disable script, hope it'll help you know what I'm talking about.

tell application "System Events"
    activate
    if UI elements enabled then
        tell expose preferences
            set properties of the top left screen corner to {activity:none, modifiers:{}}
            set properties of the top right screen corner to {activity:none, modifiers:{}}
            set properties of the bottom left screen corner to {activity:none, modifiers:{}}
            set properties of the bottom right screen corner to {activity:none, modifiers:{}}
        end tell
    else
        tell application "System Preferences"
            activate
            set current pane to pane "com.apple.preference.universalaccess"
            display dialog "UI element scripting is not enabled. Check \"Enable access for assistive devices\""
        end tell
    end if
end tell

tell application "System Preferences" to quit
Before Mavericks there was indeed a property in System Events called "Expose preference". 

Since 10.7 Lion, Expose was replaced by Mission Control, so this must be a remaining of this past time (The pref pane is called Expose.prefPane). 

But in Mavericks this property was removed and not replaced. 

tell application "System Events" to get properties returns 


security preferences
network preferences 
screen saver preferences
appearance preferences
CD and DVD preferences
dock preferences


And none of them has access to the hot corner properties. 

So, no it's currently not possible to do the same thing. Or to be more precise, to do it without UI scripting. (BTW your script does not use UI scripting features).