I'm trying to open .avi files in vegas movie studio HD platinum 10 but when I drag the files into the cutting window only the audio peaks are shown and the video is shown as media offline. The video wont show in the preview box and only the audio file is added when moved down to the editing area. I have turned off the close files bit but the files open this way from the start. I tried going back to a previous version of quicktime too ( since vegas last worked I had updated my quicktime) but to no avail. Is there something I can do to fix this?