The bottom line is that, after horsing around endlessly to synch the video and audio tracks I relinked them. I did that so they wouldn't slide around if I did any further tinkering. Once I had relinked the audio and video, I was unable to resize the video. There was no way to display the TV Safe Zone (greyed out) or move the preview image. If I unlinked the video and audio, things returned to normal.
I was able to switch back and forth as many times as I wanted, and each time the result was the same: when the audio and video were linked, I couldn't manipulate the image in the preview window.
Other clips on the same timeline were not affected.
I was working on four pretty much identical projects, using four clips from the exact same source, but my work flow was not identical because I kept finding more efficient ways to do things.
Is this related to http://forum.cyberlink.com/forum/posts/list/15/29997.page?
Am I alone in this funhouse? Jerry Schwartz