Hello. In Adobe Flash Professional CS5 (184.108.40.2065) (on intel mac running 10.7.2), I set up a document, save it, and then save it as a CS4 document. I then transfer it to another Mac (ppc, running 10.5.8) and try opening it with Adobe Flash Professional CS4 (10.0). I get the error message: "Failed to open document. … " Would anyone know why, and what to do about it?