MacBook Pro versus U-verse (2WIRE): "password is invalid"..

I run into a frustrating problem, and I hope someone out there can suggest a solution/explanation.
I got the AT&T U-verse service. Overall I am very pleased. My wireless devices (iPhone, Macbook and one Macbook pro, all running OSX10.5) have been configured without a problem, as was the case with all the older, ethernet-linked iMac (OSX10.3). I am extending the range of the RG with an ethernet-linked AppleExpress, setup as WDS. this device has been assigned an IP by the RG and is happily broadcasting. In fact, I am logged on it at this moment. All is working; however, there is this one little problem... which stomped the online tech services at AT&T and the u-verse forum.
The issue is now with one of the 2 MacBook Pro's, the one I am using to configure the RG with, and the macbook. Once they logged on via the AppleExpress, they are now both denied access to the 2WIRE with the same password they used before. Both can however login via the AppleExpress subnet which has its own password, and once in, they get an IP (assigned by the RG, not the AppleExpress) and can ping and every other device in my LAN and manage the RG via the web interface. The RG lists these PC as an etherlinked device, which is correct since they are communicating via the AppleExpress which in-turn extends the wireless but is not configured as a router.
THe key is, If security is turned OFF on the 2WIRE RG, my MacBook Pro can log in without a problem. When security is enabled again, access is denied. something in the communication is not right.
Again, the Macbook and MacBook Pro were allowed access. Denial begun after logging off, logging back on via the AppleExpress, attempting to go back to the 2WIRE. All subsequent login attempts into the 2WIRE, with the same password that successfully allowed all the OTHER wireless devices to log on, failed. A reboot ( i know...) did not change anything. The message i keep getting is "password is invalid".
Given that the login is not a problem when security is off, and that the MAC filtering has these MacBooks enabled, and that they receive an IP without a problem when logged in via the AppleExpress, we came to the assumption that the problem may be in the Mac and how it delivers the WPA password to the 2WIRE.
I then cleared all the stored passwords from KeyChain- loged in again and typed the password- and was denied again.
In desperation, I gave my computer a manual IP (in case IPv4 issues were interfering)- nothing. can log in via AE.
restarted the RG- no help either.
Although I am logged on via the AE, and I can access the internet, and all is working, I am mystified as to what can be the issue blocking the MacBook from re-connecting with the RG. How is it possible that a correct password is read as "invalid" by the 2WIRE? what can I do to fix this?
Please help me figure this one out...

Update
After a conversation with our IT guru at work, I did the following experiment:
1) set the "DHCP lease" time to 1 hour
2) log off the AE for the night and turn airport off on the MacBook
3) in the morning, took my Macbook out of sleep, set the airport to "on" and to "join network"
4) Select my 2WIRE, log in with the same password that was denied repeatedly--
AND I GOT IN, NO PROBLEM. the 2WIRE gave my Mac the same IP address it did when the PC log on to my LAN via the AE.
Now the not so happy news:
5) switch out of the 2WIRE and onto the AE, no problem- got in, and was assigned the same IP as before.
6) switch back to the 2WIRE.... got "invalid password".......
Hope that latest info triggers a "Eureka" moment for someone. I am still clueless as to what is going on.

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