I have on several occassions captured video with scene detection on then dragged a few clips to timeline. Sometime I find that the video for each clip are grouped & sometimes they are not. By this I mean I can drag a clip on the timeline to either the right or left or press delete & that the audio associated with the video will have the same things happen to it. Sometime this doesn't happen & all clips are independant with the audio & video acting seperately. I thought that the default situation was for all audio/video pairs to be attached to one another. Is this not the case or is there some setting that I have to turn on?