wlassistant gives wrong status messages

Binary package hint: wlassistant

If I connect to a hidden accesspoint, wlassistant says the connection fails. But if I try the connection with ping, firefox etc. I can use the internet with this connection.

Here is my output, if I run wlassistant from the konsole:

$ sudo wlassistant
ScimInputContextPlugin()
Loaded application options.
DHCP Client: dhclient
All executables found.
iwconfig_status: /sbin/iwconfig
==>stderr: lo no wireless extensions.

eth0 no wireless extensions.

sit0 no wireless extensions.

Wireless interface(s): wlan0
Permissions checked.
ifconfig_status: /sbin/ifconfig wlan0
scan: /sbin/iwlist wlan0 scan
Networks found: 2
Checking for active connection.
Trying to get gateway address...
...from /var/lib/dhcp3/dhclient.leases
Gateway address: 192.168.178.1
kill_dhcp: /sbin/dhclient -r wlan0
==>stderr: Internet Systems Consortium DHCP Client V3.0.3
Copyright 2004-2005 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/products/DHCP

Listening on LPF/wlan0/00:11:d8:22:a2:d5
Sending on LPF/wlan0/00:11:d8:22:a2:d5
Sending on Socket/fallback
DHCPRELEASE on wlan0 to 192.168.178.1 port 67
send_packet: Network is unreachable
send_packet: please consult README file regarding broadcast address.
ifup: /sbin/ifconfig wlan0 up
iwconfig_set: /sbin/iwconfig wlan0 mode managed channel 10 key open XXXXXXXXXXXXXXXXXXXXXXXXXXXX essid XXXXX
iwconfig_ap: /sbin/iwconfig wlan0 ap 00:04:0E:97:10:83
ifconfig_dhcp: /sbin/dhclient -q wlan0
Application options saved.
Kernel socket closed.
~ScimInputContextPlugin()
$ ping heise.de
PING heise.de (193.99.144.80) 56(84) bytes of data.
64 bytes from redirector.heise.de (193.99.144.80): icmp_seq=223 ttl=244 time=71.2 ms
64 bytes from redirector.heise.de (193.99.144.80): icmp_seq=224 ttl=244 time=71.3 ms