I am listening to embedded training files on the Quick Time player (I think). They cannot be copied to protect the information. You only have the option of listening. I used to be able to click on the Q in the audio strip and it would provide a diagonal arrow and this would allow me to expand the bar to a full screen. I then had the bar which would allow me to navigate in case I wanted to listen again or in case I wanted to move forward. After my upgrade, I can no longer expand the strip to a full screen with the adjuster. Now I have not chance to take a break in listening to these audios and most of them are at least an hour long. Thanks for your help.