I still didn't have the N800 working reliably on my home network, but it worked everywhere else I tried it, so I was determined to figure out what was wrong. I heard about a program called Kismac that helps you debug wifi, and it was a little bit of help. But the tide turned when I decided to turn off wifi routers (I had four running) and see if the N800 would start working. Well, one of my two Airport Extremes made the difference, when I turned it off, the N800 started working. So after a bit I tried turning it back on, and the N800 still worked. No explanation, but knock wood, it's still working an hour later.
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