aptitude hangs?

["Michael Yang" <michael.yxf@gmail.com>]

Whenever I install packages within aptitude view, it will hang after the package installed. I have to close the terminal(urxvt, gnome-terminal) to kill aptitude after that.

But the apt-get works fine in terminal. 
Was there issue of building the view in aptitude after new packages installed?
Or has anyone met this?
My system was upgraded from etch to lenny/sid and work with aptitude 0.4.6.1

Appreciated of your helps!
Regards.