Problems completing reservations

I've been trying to make a reservation at the DoubleTree Seattle Airport since Friday but I keep getting an error message when I get to the final screen:

Sorry for the inconvenience

Due to technical difficulties we were unable to complete your request online or through our customer help desk at this tme. We are working to rectify the problem, please try again later.

I've checked back with Hhonors.com and the reservation doesn't exist in my account.

Anyone else running into this problem or is this just an issue with this one hotel perhaps?