Blank window when connecting to public wireless network

I'm having trouble connecting my Macbook Pro to the wireless network at my folks' nursing home. The MBP can see the private and public networks, but when I try to connect to the public network, a blank window pops up - no text or buttons. My nephew's Windows laptop connects with no problems. I'm running 10.7 (Lion). Any ideas?

A guess would be that your university uses a different encryption than your home wireless and that your driver has problems with that. If you search this bbs with your driver's name (and that encryption), you will also encounter a number of freeze problems when using newer kernels. However, those drivers and kernels move quick, so if you see an error in a post from 2 months ago, the error might have vanished already.
Second, you should find out the card you are using with
lspci -nn | grep Realtek

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