I was experiencing something similar, bugged me for the past few days.
Manual configuration allowed me to see wireless options but right
clicking on the network-manage applet did not show the enable wireless
option and no wireless networks were visible. nm-tool showed no details
for my wireless interface.

I manually worked around this for a couple of days before investigating.
It turns out it didn't like some legacy cruft in my
/etc/network/interfaces, just a couple of lines for eth1 (my wireless
interface) from some testing at a conference a while ago. As soon as I
commented out all lines regarding eth1 setup, nm-tool started showing
details for eth1. I'm not sure if the applet immediately picked this up,
I was rebooting for separate reasons and after that all was working as
it should.

-- 
gutsy: wireless non-functional after update
https://bugs.launchpad.net/bugs/141394
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