Problem with display when locking time for video

When working on a short show with two still images and one long video file, when I locked the time with the timeline lock button for the video to match the length of the video, the display on the timeline for that slide went black. (This was a problem I had a number of times with Producer.) When I play the show using two monitors with the playback on monitor two, that is also black - not surprisingly. If I close out the show and re-open, the issue seems to resolved. This has happened on more than one occasion, using different video files.

On a separate note, playback with two monitors is a little funky. A few seconds into playback the size of the playback on the monitor pops just a bit to a larger size. No biggie - more annoying than anything.