I had been editing a clip and went into the edit effects section at the bottom of the edit tab. I was trying various adjustments in such areas as auto color and auto contrasts. I entered done and when I tried to view the clip again by using the play/pause toggle, it was frozen. I've edited before (although not with the edit effects part) and have always been able to play the clip again. What am I doing wrong? Thanks.
Is there a red line above the clip on your timeline?
If so, the clip will need to be rendered. Press the Enter key. When the clip has been rendered, the red line will turn green and the clip should play again and look terrific. (How often you need to render depends on the type of video you're editing, the power of your machine and the intensity of the effect.)