With Flash Player 10, the FileReference.browse and FileReference.download operations may be initiated only through ActionScript that originates from user interaction. This includes actions such as clicking the mouse or pressing the keyboard.

Growing Rails Applications in Practice

Check out our e-book. Learn to structure large Ruby on Rails codebases with the tools you already know and love.

Introduce design conventions for controllers and user-facing models
Create a system for growth
Build applications to last

Adobe - Developer Center : Understanding the security changes in Flash Player 10

Growing Rails Applications in Practice