Persistent Airport connection problems

I've been having persistent airport connection problems since upgrading to Leopard. It got so bad that I finally installed an Ethernet network in my office. However, I really want to be able to use my laptop in other rooms so I want to fix this problem if possible.
Here's what happens. When I turn Airport on, and then select my network, I am prompted to enter my password (even though it's in the keychain). When I click "OK", I get a "connection timeout" error and no connection is made. This happens on both my MacBook and my Mac Pro.
I am currently using a D-Link ethernet/wireless router, but the problem also occurs with an Airport Express which I used previously and still have. I am using mixed 802.11n and 802.11g with WPA personal security and "WPA only" mode.
One note: if I disable any kind of network security, I can easily connect to the network. So it seems to have something to do with the security setting.

Can you reconfigure your router to use WPA2? Some people have found satisfaction after switching to the security model: http://discussions.apple.com/message.jspa?messageID=7336628#7336628

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