I must have done something that I can't find to undo. When I drag new media into the timeline either above or below an existing track, that media disappears/is replaced. It does not matter if it is audio, image or video clips I am dragging in. I am using Vegas Pro 15 (Build 216). I am sure it is something I did recently because it did not do it on the last project I was working on. Can anyone help me figure this one out?

Additional info. It appears that when I drag the media in it is actually pushing everything to the right and out of view instead of just dropping the media on the track