I hit this bug today, but can't identify what I did that caused it. Indeed, there was a zombie software-center process still running, but it had no associated visible window.
I got the following output when starting software-center, each time I tried, and it resulted in the blank screen:
$ software-center
2011-06-02 16:36:16,475 - softwarecenter - INFO - Using data (UI, xapian) from current dir
/usr/share/software-center/softwarecenter/SimpleGtkbuilderApp.py:32: RuntimeWarning: missing handler 'on_window_main_button_press_event'
self.builder.connect_signals(self)
Doing the 'killall' software-center' made everything work again.
I hit this bug today, but can't identify what I did that caused it. Indeed, there was a zombie software-center process still running, but it had no associated visible window.
I got the following output when starting software-center, each time I tried, and it resulted in the blank screen:
$ software-center software- center/ softwarecenter/ SimpleGtkbuilde rApp.py: 32: RuntimeWarning: missing handler 'on_window_ main_button_ press_event' builder. connect_ signals( self)
2011-06-02 16:36:16,475 - softwarecenter - INFO - Using data (UI, xapian) from current dir
/usr/share/
self.
Doing the 'killall' software-center' made everything work again.