Hi, After reinstalling CT5 with Sonar5, I did The 3 tests with F12 are successful. By opening a project I press ctrl6. I can go through the tracks. But when I press "play", I hear after some seconds the tipical ring of windows that means: there is a problem. But CT4 and Jaws don't say anything. Then, it's difficult to stop the song. It's impossible here to record or to change something in the project. Other problems are: alt!enter gives the information: failed action, and the letter for loop gives no result. I must give a work for saturday. Unfortunatly I uninstalled CT4, because I thought, the problem is coming because I keep two versions of CT on my machine. Thank you for your help J-P Millier CT5 E1401551T