MOV files won't move from Project to Sequence

After creating and exporting a video, I went in to re-edit some clips. Apparently auto-save didn't save the sequence, just the entire mov.file. So, I had to start over. I started a new project, re-imported the original files, and now it won't let me move the files from the Project location over to the sequence box. It will move the audio, but not the video. I cannot figure out why. I've restarted everything, and still no good. Please see video example.