I do also have this problem, my network ran on channel 13 which wasn't listed 
on second boot.
First boot after upgrading the network manager even hasn't been started - dunno 
if this is linked to this bug.
After setting network channel to 9 it was listed, but a connection could only 
be established after another reboot ...
[   25.955863] iwlagn: Detected Intel Wireless WiFi Link 4965AGN REV=0x4
[   26.000010] iwlagn: Tunable channels: 13 802.11bg, 19 802.11a channels

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Cannot use wireless channels 12 and 13
https://bugs.launchpad.net/bugs/268388
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