usb-creator-gtk fails to format usb stick

[onur.novak]

When clicking on delete data and entering my password, after some time a popup apears:

org.freedesktop.DBus.Python.gi._glib.GError: Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/dbus/service.py", line 707, in _message_cb
    retval = candidate_method(self, *args, **keywords)
  File "/usr/share/usb-creator/usb-creator-helper", line 239, in Format
    block.call_format_sync('dos', GLib.Variant('a{sv}', {'erase': GLib.Variant('s', '')}), None)
gi._glib.GError: GDBus.Error:org.freedesktop.UDisks2.Error.Failed: Error synchronizing after initial wipe: Timed out waiting for object

I created a fresh partition table with gparted and rebootet, the error remains the same. The usb stick contains a single partition, that works as expected for other programms.

[onur.novak (onur-novak)]

$ lsb_release -rd
Description: Ubuntu 14.04 LTS
Release: 14.04
$ apt-cache policy usb-creator-gtk
usb-creator-gtk:
  Installiert: 0.2.56
  Installationskandidat: 0.2.56
  Versionstabelle:
 *** 0.2.56 0
        500 http://de.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status

[Launchpad Janitor (janitor)]

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