Same problem on Hardy heron now. 
~$ kbluemon
process 8170: arguments to dbus_message_new_method_call() were incorrect, assert
ion "_dbus_check_is_valid_path (path)" failed in file dbus-message.c line 1074.
This is normally a bug in some application using the D-Bus library.
process 8170: arguments to dbus_message_append_args_valist() were incorrect, ass
ertion "message != NULL" failed in file dbus-message.c line 1521.
This is normally a bug in some application using the D-Bus library.
process 8170: arguments to dbus_connection_send_with_reply_and_block() were inco
rrect, assertion "message != NULL" failed in file dbus-connection.c line 3252.
This is normally a bug in some application using the D-Bus library.
process 8170: arguments to dbus_message_unref() were incorrect, assertion "messa
ge != NULL" failed in file dbus-message.c line 1391.
This is normally a bug in some application using the D-Bus library.
process 8170: arguments to dbus_message_new_method_call() were incorrect, assert
ion "_dbus_check_is_valid_path (path)" failed in file dbus-message.c line 1074.
This is normally a bug in some application using the D-Bus library.
process 8170: arguments to dbus_message_append_args_valist() were incorrect, ass
ertion "message != NULL" failed in file dbus-message.c line 1521.
This is normally a bug in some application using the D-Bus library.
process 8170: arguments to dbus_connection_send_with_reply_and_block() were inco
rrect, assertion "message != NULL" failed in file dbus-connection.c line 3252.
This is normally a bug in some application using the D-Bus library.
process 8170: arguments to dbus_message_unref() were incorrect, assertion "messa
ge != NULL" failed in file dbus-message.c line 1391.
This is normally a bug in some application using the D-Bus library.
process 8170: arguments to dbus_message_new_method_call() were incorrect, assert
ion "_dbus_check_is_valid_path (path)" failed in file dbus-message.c line 1074.
This is normally a bug in some application using the D-Bus library.
process 8170: arguments to dbus_message_append_args_valist() were incorrect, ass                                                                                                   ertion "message != NULL" failed in file dbus-message.c line 1521.
This is normally a bug in some application using the D-Bus library.
process 8170: arguments to dbus_connection_send_with_reply_and_block() were inco                                                                                                   rrect, assertion "message != NULL" failed in file dbus-connection.c line 3252.
This is normally a bug in some application using the D-Bus library.
process 8170: arguments to dbus_message_unref() were incorrect, assertion "messa                                                                                                   ge != NULL" failed in file dbus-message.c line 1391.
This is normally a bug in some application using the D-Bus library.
process 8170: arguments to dbus_message_new_method_call() were incorrect, assert                                                                                                   ion "_dbus_check_is_valid_path (path)" failed in file dbus-message.c line 1074.
This is normally a bug in some application using the D-Bus library.
process 8170: arguments to dbus_message_append_args_valist() were incorrect, ass                                                                                                   ertion "message != NULL" failed in file dbus-message.c line 1521.
This is normally a bug in some application using the D-Bus library.
process 8170: arguments to dbus_connection_send_with_reply_and_block() were inco                                                                                                   rrect, assertion "message != NULL" failed in file dbus-connection.c line 3252.
This is normally a bug in some application using the D-Bus library.
process 8170: arguments to dbus_message_unref() were incorrect, assertion "messa                                                                                                   ge != NULL" failed in file dbus-message.c line 1391.
This is normally a bug in some application using the D-Bus library.
egor@nowhere:~$ process 8170: arguments to dbus_message_new_method_call() were incorrect, assertion "_dbus_check_is_valid_path (path)" failed in file dbus-message.c line 1074.