Possible BUG: Mac OS 10.9.3 - Videos (mp4s) not showing for preview in edit screen, but will preview

I've come across a possible bug this morning while uploading videos for VBS in a couple of weeks. I added all my videos and everything plays properly, however, on some of the videos I can preview them in the edit screen and on others I can't (there's just a blank black slide where the video preview normally is). Any idea what may be going on?
Thanks,
Josh
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Is the first frame of the video black? If so you can use the scrubber at upload time to select a frame with a more useful preview image.
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I knew about that. What I'm saying is that the video in the Edit mode shows up as a blank black screen. On other videos there is a "Play" triangle over laying and I can preview the video from within the Edit screen. To see the video, I have to switch over to preview mode. I've never had to do this before. It just started happening this morning. I'm wondering if it's an issue with the media cache on my computer. How do I clear that again? I switched hard drives and it was supposed to re-download everything after a clean install. So, I'm not sure what's going on.
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Does this happen with every type of video? or only certain file types/videos you have uploaded?
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All the videos I added this morning were mp4s. Some show, some don't. They all work in preview mode and on-air... just not all work in edit mode. Thanks!
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Our presentation is "VBS 2014 Content" if you want to take a look.
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Cool I will take a look and let you know what I find. If I can reproduce the issue, I will publish a bug report and give you an update.
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