I pulled up my itinerary to check in for my flights this morning. I click on the green 'Check-in' button, the page reloads, and I just get my flight summary page back, and now the ' [days] until departure' box is empty. The next page should be the page where I indicate how many checked bags I may have.

Browser: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.9) Gecko/20100315 Firefox/3.0.11 NET_mmhpset (.NET CLR 3.5.30729)

Edit to add: same result in IE 8

Update: I found out that it wasn't a bug with the website, but it was a name display format issue on my ticket (booked by a travel agent) that was blocking check-in.