I had a similar problem some months back.  I did not find the explanation, but did find a solution.  Assuming the wireless network is named foo, delete foo and then let network manager rediscover it.  If it needs a passphrase it will then re-ask and hopefully you will be back in business like I was.

On Mon, Apr 13, 2009 at 9:33 AM, Eric Cope <eric.cope@gmail.com> wrote:
I'll check tonight. I tried rolling back kernels and it didn't help, so I suspect its an update issue...
I'll keep you posted.


On Mon, Apr 13, 2009 at 9:24 AM, Craig White <craigwhite@azapple.com> wrote:
On Mon, 2009-04-13 at 09:14 -0700, Eric Cope wrote:
> Hello all,
> I have an IBM A31 laptop that I dual boot Ubuntu and XP. My wireless
> was working great up to a couple of days ago. When I boot into
> Windows, it works fine.When I boot into Ubuntu, it sees the network,
> but fails to connect. I have tried rebooting my router and my laptop
> to no avail. Any ideas?
----
logs?

assuming that you are connecting via NetworkManager as 'user' try going
into command line as user and executing 'ifup wlan0' and/or 'ifdown
wlan0' (or whatever interface your wireless is set to be).

It's possible some updates might have changed the interface from
NM_CONTROLLED=yes to something else

Craig


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Dazed_75 a.k.a. Larry