Agile web development with Rails - Issue with Depot app

You are in IE right? Try firefox. This sounds like an IE problem I ran into a while back. Failing that, use FireBug under firefox to verify the response to the AJAX call is what you think it is, and the CSS class or properties are being set. If you are relying on some javascript to post-process the HTML to add CSS tags (as DOJO does), then this may not be processing the updated HTML.