Same thing. Plasma-widget-networkmanagement doesn't work with fixed ip-add. on 
my hp550 with kubuntu karmic.
My configuration:
SSID: default
Mode: Ad hoc or Infrastructure
BSSID:
Interface: eth2
MTU: Automatic
Security: None
Configure: Manual
IP-address: 192.168.1.100
Subnetwork mask: 255.255.255.0
Gateway: 192.168.1.1
Search domians: 
DNS-servers: 208.67.222.222, 208.67.220.220

What seems to happen, is that the widget does not route through the gateway:
# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.1.0     *               255.255.255.0   U     2      0        0 eth2
link-local      *               255.255.0.0     U     1000   0        0 eth2
r...@l# host dk-hostmaster.dk
;; connection timed out; no servers could be reached
r...@lap# ping 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_seq=1 ttl=127 time=7.41 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=127 time=2.54 ms
r...@lap# route add default gw 192.168.1.1
r...@lap# host dk-hostmaster.dk
dk-hostmaster.dk has address 193.163.102.23
dk-hostmaster.dk mail is handled by 10 vocal.dk-hostmaster.dk.

If I restart the connection, the gateway route is lost again, but immediately 
re-established by:
r...@lap# route add default gw 192.168.1.1

If I set Configure: Automatic (dhcp), everything works fine, and it
routes throgh the gateway.

Conclusion, the bug is that manual fixing addresses etc does not
establish a routing through the gateway.

-- 
changing the wired network profile, doesn't work
https://bugs.launchpad.net/bugs/443235
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