I have a fresh installation of Ubuntu 12.10 on a Packard Bell notebook, with Gnome3 instead of Unity. Now when I try to connect to a WPA/WPA2 Enterprise secured WLAN (PEAP Authentication, MSCHAPv2 as Inner Authentication), after entering the login details I'm prompted to either select a root CA or ignore the message. But I can't hit the buttons or tick the box to not ask again this question. It's completely unselectable, so I end up not being able to connect to the wifi. I also tried to select the CA before trying to connect, but what happens then is that the prompt appears while the system starts connecting to the wifi. Unfortunately, it fails to do so.
If you know a way to connect to a wifi with such configuration, I'm also happy with that. The used CA would be the Entrust.net Secure Server Certificate Authority.