In case you didn't see it, the team update from 2012-01-20 states:
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The DAP-1522 wireless bridge required for competition will not link to FIRST’s field access point if there are more than approximately 60 active access points in the venue.
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With your school's wifi on, people standing around with wifi-enabled phones, iPods, laptops, and such, you may be approaching or exceeding that limit locally. You could try to get one of the alternate bridges mentioned in the team update for local testing.