I have not been able to do Web Check-in a couple times this month at Hyatt Dulles. When I try, I get to a page that asks me confirm by entering my name and check-out date. I then get an error stating they can't find my reservation, and I have to call for help. I had no problems using it for Fair Lakes or Crystal City this month, though.

Sorry if I'm the last one to figure this out, but I haven't noticed it mentioned it before in this forum: The bonus code for the web checkin is W5. Until this week, I have always had to call in to CS after my stay posted to get my web check-in bonus. I finally noticed the W5 code in the bonus section of my bill the two stays I had this past week, which I had never seen before. The bonus automatically showed up with the stay credit. Now I know to make sure W5 is in the bonus secton when I check out.