usb-creator-gtk crashed with img file (dbus TypeError)

[ALaunchpadUser]

Binary package hint: usb-creator-gtk

ps axu |grep usb-creator-gtk:

USERNAME 1371 2.4 1.0 54104 21736 pts/2 S+ 19:44 0:01 /usr/bin/python /usr/bin/usb-creator-gtk

can't create bootable usb stick with img file.

usb-creator 2010-04-27 19:35:40,129 (DEBUG) backend.py:22: Backend told to add: /home/hpweecks/Downloads/PCBSD8.0-x86-USB-bootonly.img
usb-creator 2010-04-27 19:35:40,131 (DEBUG) frontend.py:201: add_source: /home/hpweecks/Downloads/PCBSD8.0-x86-USB-bootonly.img
usb-creator 2010-04-27 19:35:55,581 (DEBUG) backend.py:259: install source: /home/hpweecks/Downloads/PCBSD8.0-x86-USB-bootonly.img
usb-creator 2010-04-27 19:35:55,583 (DEBUG) backend.py:260: install target: /org/freedesktop/UDisks/devices/sdb1
usb-creator 2010-04-27 19:35:55,583 (DEBUG) backend.py:261: install persistence: 128
usb-creator 2010-04-27 19:35:55,607 (ERROR) connection.py:615: Unable to set arguments (None,) according to signature u's': <type 'exceptions.TypeError'>: Expected a string or unicode object
usb-creator 2010-04-27 19:35:55,609 (ERROR) frontend.py:669: Installation failed.
Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/usbcreator/frontends/gtk/frontend.py", line 607, in install
    self.backend.install(source, target, persist)
  File "/usr/lib/python2.6/dist-packages/usbcreator/backends/udisks/backend.py", line 300, in install
    self.helper.Unmount(target)
  File "/usr/lib/pymodules/python2.6/dbus/proxies.py", line 140, in __call__
    **keywords)
  File "/usr/lib/pymodules/python2.6/dbus/connection.py", line 610, in call_blocking
    message.append(signature=signature, *args)
TypeError: Expected a string or unicode object

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: usb-creator-gtk 0.2.22
ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-21-generic i686
Architecture: i386
Date: Tue Apr 27 19:36:10 2010
PackageArchitecture: all
ProcEnviron:
 LANG=de_DE.utf8
 SHELL=/bin/bash
SourcePackage: usb-creator

[ALaunchpadUser (wegs-petra+ubuntuone)]

unetbootin also failed to write PCBSD8.0-x86-USB-bootonly.img to usb stick. F***k. ;)

[ALaunchpadUser (wegs-petra+ubuntuone)]

ups, as well as dd if=PCBSD8.0-x86-USB-bootonly.img /dev/sdb failed!