abrt version: 2.0.3
architecture:   x86_64
cmdline:        /usr/bin/python /usr/share/ibus/ui/gtk/main.py
component:      ibus
executable:     /usr/share/ibus/ui/gtk/main.py
kernel:         2.6.38.8-32.fc15.x86_64
os_release:     Fedora release 15 (Lovelock)
package:        ibus-1.3.99.20110419-7.fc15
reason:         connection.py:630:call_blocking:DBusException: org.freedesktop.DBus.Error.Failed: Context which does not has focus can not change engine to xkb:layout:default.
time:           Mon Jul  4 14:18:18 2011

backtrace:
:connection.py:630:call_blocking:DBusException: org.freedesktop.DBus.Error.Failed: Context which does not has focus can not change engine to xkb:layout:default.
:
:Traceback (most recent call last):
:  File "/usr/share/ibus/ui/gtk/panel.py", line 620, in __im_menu_item_activate_cb
:    self.__focus_ic.set_bridge_engine()
:  File "/usr/lib/python2.7/site-packages/ibus/inputcontext.py", line 287, in set_bridge_engine
:    return self.__context.SetEngine(_config.DEFAULT_BRIDGE_ENGINE_NAME)
:  File "/usr/lib/python2.7/site-packages/dbus/proxies.py", line 140, in __call__
:    **keywords)
:  File "/usr/lib/python2.7/site-packages/dbus/connection.py", line 630, in call_blocking
:    message, timeout)
:DBusException: org.freedesktop.DBus.Error.Failed: Context which does not has focus can not change engine to xkb:layout:default.
:
:Local variables in innermost frame:
:byte_arrays: False
:self: <dbus.connection.Connection object at 0x2709470>
:args: ('xkb:layout:default',)
:utf8_strings: False
:bus_name: 'org.freedesktop.IBus'
:get_args_opts: {'byte_arrays': False, 'utf8_strings': False}
:object_path: dbus.ObjectPath('/org/freedesktop/IBus/InputContext_33')
:timeout: -1.0
:signature: u's'
:dbus_interface: 'org.freedesktop.IBus.InputContext'
:message: <dbus.lowlevel.MethodCallMessage object at 0x265cb28>
:method: 'SetEngine'

comment:
:1) Enable IBus
:2) Try switching between the default English XKB layout and ibus-m17n IMs
:3) Eventually English XKB disappears and IBus crashes.