Leopard won't accept WPA password where Tiger accepted

I've been doing all sorts of diagnostic experiments trying to figure out why I can't wirelessly connect under Leopard using WPA encryption while I was able to do so successfully under Tiger... With Leopard, encryption turned off or WEP encryption works just fine but NOT WPA and that's the encryption I want to use.. I've finally done what I believe to be a consistent and well controlled experiment which is telling me that Leopard will not accept a WPA password that is perfectly acceptable under Tiger... They changed some of the wireless interface gui's between Tiger and Leopard but there is one that appears to be identical between the two and that is the Network Setup Assistant.app that is found (under either Tiger or Leopard) at /System/Library/CoreServices... And I also have a cloned version of my two week old Tiger (10.4.9) system with all my files contained on an external firewire drive. If I boot off that Tiger system and walk through the above mentioned Assistant, when I get to the place where it asks me to enter the WPA password, it accepts that password and moves forward to the next step 100% of the time. I've tried it many times... If I then reboot under Leopard, walk through precisely the same assistant and enter precisely the same password (I've typed it many times, used copy and paste many other times to ensure no typos), instead of connecting I get (100% of the time) a message that says "Sorry, The Password you entered is invalid".... I also notice that it takes a while (maybe 10 seconds) for it to come back with that error for whatever that might be worth... The reason the "100% of the time" above is important is because when I just go to Network in system preferences and walk through that wizard while trying to set up this WPA network, I usually get simply "connection failed" but if I just keep trying eventually it always says it connected (though in reality it never does)... And it never tells me that the password is invalid but this other wizard tells me that 100 % of the time... So when it tells me it connected, I will then go try to connect to a web page and it never works... So why it sometimes tells me it connects I can't say but reality, it never does and now I'm slowly becoming convinced it is because it never accepts my WPA password, never....
So does anyone out there know whether there is some particular format for WPA passwords??? My router is a NetGear WGU624... I've contacted NetGear about this and they are worthless... I might try them again now that I've learned that the password is NEVER being accepted but I don't hold much hope that they can help...
Any ideas about what might be going wrong with passwords under WPA in Leopard???
thanks... bob...

I've been pursuing the same issue for a few days and just found a resolution (but not the root cause). (Same symptoms seen by Jason Guinn's over on http://discussions.apple.com/thread.jspa?threadID=1195706) I upgraded my PowerBook and MBP just fine but my iMac had the problems you and Jason describe.
Dig it. This WPA2 password:
3R3HFVNGxe845xrk
Works for the PowerBook and MBP. But for some reason when I use that password from the iMac, I get the (broken) behavior described. Took my setup to the Genius and he reset my Airport Extreme base station and set the password to:
testtest
And the problematic behavior resolved. I got full bars and was able to ping and browse everything. I have since changed my password to something more secure. My advice is start with testtest and see if the problem resolves. Then experiment with some stronger WPA2 passwords that work for all your systems.
Incidentally, I had similar issues with the wireless on my TiVO when I set it up about six months ago. For some reason their system wouldn't accept the (long) WPA2 password I was using that the time. At that time I configured the shorter one (3R3HFVNGxe845xrk) for the sake of the TiVO. It's so odd that two vendors have had bugs exercised by particular key material. So wierd.

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