I believe a similar thing happened to me when I changed from using WEP
to WPA on my access point.
** Changed in: network-manager (Ubuntu)
Importance: Undecided => Medium
Status: New => Confirmed
** Changed in: network-manager (Ubuntu)
Importance: Medium => Low
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[Gutsy] Unable to connect to WPA2 if the AP was previously using WPA
https://bugs.launchpad.net/bugs/140422
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