Doesn't start up, issues with cache

[Giedrius Statkevčius]

If you run the software center from the Xfce menu it shows a blank window.

If I run "software-center" from the terminal I get this:

WARNING: gnome-keyring:: couldn't connect to: /tmp/keyring-q8LAJq/pkcs11: Toks failas ar aplankas neegzistuoja
2012-09-15 22:51:24,780 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/gi/importer.py', 51, 'find_module')'
2012-09-15 22:51:24,779 - root - ERROR - Could not find any typelib for Gst
2012-09-15 22:51:24,867 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None'
2012-09-15 22:51:24,875 - softwarecenter.db.database - INFO - open() database: path=None use_axi=True use_agent=True
2012-09-15 22:51:24,979 - softwarecenter.region - WARNING - failed to use geoclue: 'org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Geoclue.Master was not provided by any .service files'
2012-09-15 22:51:25,368 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file
2012-09-15 22:51:25,660 - softwarecenter.ui.gtk3.app - INFO - show_available_packages: search_text is '', app is None.

And the window doesn't even show up and I can't close software-center with ctrl-c.

Here are some info about package/system:

giedrius@giedriusbuntu:~$ apt-cache show "software-center"
Package: software-center
Priority: optional
Section: gnome
Installed-Size: 4256
Maintainer: Michael Vogt <email address hidden>
Architecture: all
Version: 5.2.5

giedrius@giedriusbuntu:~$ uname -a
Linux giedriusbuntu 3.2.0-30-generic #48-Ubuntu SMP Fri Aug 24 16:54:40 UTC 2012 i686 athlon i386 GNU/Linux

Distribution: Xubuntu 12.04.1

I suspect this glitch may have appeared after some upgrade because it was working fine yesterday.

[Giedrius Statkevčius (giedrius-statkevicius)]

Problem can be fixed by deleting ~/.cache/software-center/
I still think this is a bug in the software-center.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Cormac (cormac-wilcox)]

I have the same problem - window doesn't show up if selected from Dash on first attempt, on second attempt I just get a blank window.
If I try start it from the terminal I get this:
user@user-XPS-M1530:~$ software-center
2012-10-21 18:59:04,798 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None'
2012-10-21 18:59:04,809 - softwarecenter.db.database - INFO - open() database: path=None use_axi=True use_agent=True

I have tried deleting the cache with no change:
sudo rm -r ~/.cache/software-center/