I have a problem that when I click on a scene and drag it to insert into another point in the timeline it leaves a duplicate in the original spot, that is not usually visible on the timeline (sometimes can be noticed as a black "empty" frame). the duration is usually reduced to a very short period of time, so can usually only be seen during video preview of another scene I thought was put in it's place. I will be previewing a scene and all of the sudden the "moved" scene with pop up for an instant within the clip I am watching. I have had to freeze the frames and manually go to the point at which it appears, click on "clip", then go to trim, reset the length so it is again visible on the timeline, and then click on it and delete it. It is so very annoying not to be able to move clips around and position them without these "phantom copies." It happens with both videos and images. I cannot figure out how to avoid this and then how to easily detect and delete them without watching the full video very closely. A side issue to this is my produced video ended up being over 52 minutes when the timeline is only ~20, because I think 'phantom clips" exist where I initially pulled them in from the library off the timeline and dragged them in in the order I wanted. How do I detect all these duplicate phantom clips and set the true end to my video for production???