network-manager forgets WEP password and prompts for it every time

Worked fine until upgraded to oneiric. Looks like a regression of bug 36651.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: network-manager 0.9.1.90-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-11.18-generic-pae 3.0.4
Uname: Linux 3.0.0-11-generic-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu1
Architecture: i386
CRDA: Error: [Errno 2] No such file or directory
Date: Wed Sep 28 13:35:14 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
IpRoute:
 default via 192.168.1.1 dev wlan0 proto static
 169.254.0.0/16 dev wlan0 scope link metric 1000
 192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.2
 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
ProcEnviron:
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: network-manager
UpgradeStatus: Upgraded to oneiric on 2011-09-25 (3 days ago)