Applescript Rules Don't Work in 10.8 Mail.app

Question

Very simple thing Im trying to do here. Set up a rules to run a simple growl notification script when a new mail with a vertain subject arrives. This script works perfectly file in the editor and runs file outside of the mail.app.
Set to to run as a rule using the run actionscript option in mail.app - but it will never run.
Why would this script run fine outside of mail.app, but not as an actionscript rule?
tell application "System Events"
    set isRunning to (count of (every process whose bundle identifier is "com.Growl.GrowlHelperApp")) > 0
end tell
if isRunning then
    tell application id "com.Growl.GrowlHelperApp"
        -- Make a list of all the notification types
        -- that this script will ever send:
        set the allNotificationsList to ¬
            {"Payment Received"}
        -- Make a list of the notifications
        -- that will be enabled by default.     
        -- Those not enabled by default can be enabled later
        -- in the 'Applications' tab of the growl prefpane.
        set the enabledNotificationsList to ¬
            {"Payment Received"}
        -- Register our script with growl.
        -- You can optionally (as here) set a default icon
        -- for this script's notifications.
        register as application ¬
            "PayPal Alert" all notifications allNotificationsList ¬
            default notifications enabledNotificationsList ¬
        --       Send a Notification...
        notify with name ¬
            "Payment Received" title ¬
            "Payment Received" description ¬
            "You have received a payment." application name "PayPal Alert"
    end tell
end if

Answer 1

system preferences>keyboard>keyboard shortcuts doesn't give you anything?