Hi
If you add a couple of clips to the timeline followed by a copy of one of them that you pasted back into the media list (even though it copies as same name(2) , then the project loses the copy file when reloaded. In fact, only the sound track is copied in the project. The clip video track copy is not present. and leaves a gap. Although the copy/paste controls are present if one clicks the thumbnail in the media list, it may be an oversight or perhaps it just refers to the sound track. Changing the name of the copied clip in the media list makes no difference either. Note you have the ST (muted) under the missing frame sections.
"If it makes a difference, I have taken more than one clip from the same video and posted it in the timeline. How i did this was by copying the video in the Video Files window and pasting it there again.. then renaming the file in that same window... and selecting a different section...hence u see (13-1) in there. same file, but different sections were taken."
This is why you have a problem. The correct way to insert a duplicate clip is simply to select the same clip again from the media list. There is no need to make a copy of it.
If a different section of the same clip is required then it should be re-selected from the media list and edited in the left hand clip preview pane again using the IN/OUT markers. (Or directly edited on the timeline if placed there.)
You must re-select the same clip from the media list over and over again and use the IN/OUT markers to create numerous re-edits. The re-edited clip can be added each time to the sequence line by clicking the green down arrow. After each addition, the geen arrow becomes inoperative but reselecting the clip again for the next edit brings it back.
Nat