I booked a stay for late December back in February 2012.
The hotel "converted" my booking from standard to "non refundable,non-modifiable".
I was never informed about this "change" and saw it under my Hyatt account by accident. I called Hyatt GP but they said that I should talk to the hotel manager.

The original reservation confirmation clearly states
CANCELLATION POLICY: CANCEL BY 3PM EST 24 HOURS PRIOR TO ARRIVAL

When I go to Hyatt.com I see - Cancellation Policy: Non Refundable/Full Prepayment/No Changes

I need to modify my reservations and new your 2 cents about how to approach the manager?

P.S. My guess about why the hotel made the booking non-refundable is because the hotel was selected to become an official college football bowl hotel over the summer.

RM