Originally Posted by ralfp

Recently (yesterday) I started having problems signing in to CO.com. I go to the homepage and click on my next reservation. As usual I get the sign in screen. I enter the PIN and click the sign in button. The next page is the sign in screen; there's no error message or anything. Nothing has changed on my end:

Eventually I can get to my reservation (trying different paths to get there).

Using Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.7) Gecko/20070914 Firefox/2.0.0.7 on WinXP, cookies enabled, not storing passwords on my machine).