Which publish type are you opening in your browser? The local or the deploy to web?
What OS? What browser? What version of Flash Catalyst?
Have you tried a simple FC project as well?
a run the project from the menu...after save it...but when goes to the browser nothing happen...even i tried in local, ffrom the files and open it in browser nothing happen....i use flash catalyst cs 5.5...yes tried simple flash catalyst project anda not working in browser..
Which OS? I assume you have tried different browsers? You are opening the Main.html file correct? Could you post the project so I could try it on a different machine.