The server behaviors are showing up for me when I open your page, so it isn't an issue with the page itself. Are the other server behaviors showing, or is the Server Behaviors panel blank? Have you tried opening and closing Dreamweaver and re-opening the page? I've seen issues where that window won't refresh and restarting Dreamweaver can often get it working again.
If that doesn't work let us know and I'll open a support ticket so that an engineer can call and help debug this issue over the phone.