Ok I downloaded the app I can login it but I seem to frequently get a message
saying "Kuler Kutoff! Your session has timed out,please sign in again." I
happens when I try to load themes.
The message occurs sometimes when there is a timeout due to network problems. Coming back to the website, since you can login with the AIR app, the problem is specific to some setting within the website. Have you tried clearing the browser cache/checking whether the problem exists in some other browser. How much cache size is allocated to kuler.adobe.com in the Flash Player Settings as discussed in the mail thread http://forums.adobe.com/message/3690554#3690554. Information regarding the OS version and the browser would be useful in finding the cause of the issue.