I've recently updated Premire Pro, and ever since the second video file I import doesn't have working video. It's not native to the file, as I tried importing them in a different order, and it's always the second file I upload that has the problem. Originally the top (football field) had the issue, but whane I restarted Premire, and imported it first it worked. In my excitement that I had fixed the problem, I tried imported ht bottom (green/blue) and it had the exact same problem. I attached a screen shot below, and as you can see the video is previewed fine, but doesn't show video in the little grey box at the bottime right of the preview. Being under a soft, but fast approaching deadline you can Imagine I'm a little stressed, and fatigued so I may be doing something stupid (up until a moment ago I didn't even know what a codec was). If it helps, I'm on an updated Mac Mini, and I haven't had this problem on my laptop, but I really edit on that one.