this looks like the issue mention on the NM mailing list. http://mail.gnome.org/archives/networkmanager-list/2006-August/msg00023.html
the patch in that thread was commited
** Changed in: network-manager (Ubuntu)
Status: Unconfirmed => Confirmed
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libnm-util0 for network-manager on ppc does not work with wpa passphrases
https://launchpad.net/bugs/52922
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