Under Dapper, I had the same problem, only able to connect to encrypted networks. I'm using ndiswrapper/Intel neti2220 driver. I can connect to non-encrypted networkds through the standard "Network settings" dialogue.
Under Edgy, network-manager doesn't connect to any networks, encrypted or non-encrypted. It just attempts until timeout.
Under Dapper, I had the same problem, only able to connect to encrypted networks. I'm using ndiswrapper/Intel neti2220 driver. I can connect to non-encrypted networkds through the standard "Network settings" dialogue.
Under Edgy, network-manager doesn't connect to any networks, encrypted or non-encrypted. It just attempts until timeout.