A coworker and I just checked out of the Westin Bonaventure today on gov rates. While we didn't have the problem you mentioned, for each of us they tried to give us rooms that were not what we reserved (doubles instead of kings, told us that we both didn'thave profiles setup when we did, etc).

My biggest annoyance has just been places that only offer governement rates above the per diem. Like in SF (which went from $159 to $139 this year) all the hotels dropped to the new lower rate except for the W. I can understand not offering the rate when they are booked up, but choosing not to offer it at all...