I've had the same issue with my BCM4328.
Applying this patch fixed it.
http://worldofxor.blogspot.com/2008/12/it-works-broadcom-official-wireless.html
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[Broadcom BCM4315] Cannot connect to hidden SSID network
https://bugs.launchpad.net/bugs/310758
You received this bug notification because you
We are closing this bug report because it lacks the information we need
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Please reopen it if you can give us the missing information, and don't
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better. Could you please add the /var/log/syslog to your bug report as
an attachment? Also you can submit more information for it by looking to
https://wiki.ubuntu.com/DebuggingNetworkManager , Thanks in advance.
** Changed
