Airport Express as Bridge = Connected Device gets no IP Address

I just purchased an Airport Express with 802.11n to use as a wireless bridge to my Airport Extreme with 802.11n (Gigabit Ethernet). I've got the Express joining the Extreme's network just fine.
I'm not able to get an IP Address via DHCP when I connect a device (iMac or Sony VAIO Laptop) to the Express' ethernet port. I also connected a device (ReadyNAS) with a static IP address to the Express and could never communicate with the ReadyNAS either.
Under the "Wireless" tab in the Airport Utility I have "Join a wireless network" selected and the "Allow Ethernet clients" checkbox selected on the Express.
Both ethernet and wireless clients (including the Express) are correctly assigned IP Addresses from the Extreme.
This is a brand new Airport Express with 802.11n with current firmware:7.4.2
The Extreme Base Station is set to "802.11n (b/g compatible)" mode.
I'm using a standard Cat5E patch cable not a crossover cable.
Thanks for the help!

I apologize for taking up your time. I had bought this to use with my PS3 (60GB Launch model with 802.11b) but hadn't used the PS3 in the equation yet. I kind of gave up on the project for awhile and unplugged the Express. Just for giggles I plugged it in later and cabled it up to the PS3 for the first time. Worked perfectly. Now my PS3 downloads are flying.
I'm not sure what solved the problem but it is working great now! Thanks again for the help.

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