Back to my Mac and tv.

Hopefully I can explain this properly.
I have 2 tv's and they have been working flawlessly for over a year, one of them will not stay connected if I enable NAT on my router. Mobileme is asking me to enable NAT on my airport express so that back to my Mac will function. Once I do that, one tv falls of the network and will not come back no matter what I do. The only way it comes back is if I turn NAT off in my airport express settings. One should have nothing to do with the other according to Applecare and the Genius Bar @ my local Apple Store. Any ideas guys?
/Users/Mark/Desktop/Picture 1.png

Do you have any NAT rules set up that might affect the IP address being used by the tv.

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