I've been having some difficult problems when making changes to video clips I've already trimmed and added to the timeline. I've ended up in a siuation where fragments of a clip are being shown and heard on the monitor screen, but there is no sign of the clip fragment on the timeline. I've even dragged the video clips immediately adjacent onto the video channel below (to see if there was anything hidden underneath), leaving a gap on the main timeline and the phantom clip still plays when the cursor is on the blank portion of the main video channel. Switching to storyboard view then shows one or more blank clips which cannot be deleted. It's so frustrating because when it happens, it takes me a long time to try to fathom out how to resolve the issue. Has anyone else experienced this problem and if so, how did you resolve it?