We found out today that there is a 20 character limit to the online CB when my wife tried to make another character heh. What do you mean lack of feat/power preview? Clicking on it gives a full description.
As far as fixing your issue, some people have previously reported that doing ctrl-F5 to clear cookies and reentering their login/pswd worked. I found that Firefox and Chrome seemed to give me a lot more issues than using IE with it. I never use IE otherwise, but Silverlight does seem to play better w/IE.