[1.0.1] observe region not working --- specify observe time in any case (bug)

Hi,

I am using the below script to see how observe is working with onChange. I am observing skpe chat window and want to open a popup a message if i receive a message in skype chat window. But this is not working. Am i selecting the region incorrectly? What is the correct way to select the region?

I am a newbie, please help

def changed(event):
        popup('something changed')
        print "something changed in ", event.region
        for ch in event.changes:
                ch.highlight() # highlight all changes
        sleep(1)
        for ch in event.changes:
                ch.highlight() # turn off the highlights
with selectRegion("select a region to observe") as r:
    # any change in r larger than 50 pixels would trigger the changed function
    onChange(50, changed)
    observe(background=True)

wait(30) # another way to observe for 30 seconds
r.stopObserver()