I put a roughly 8 hour video into Sony Vegas, then made a 7 minute subclip from it and put that into my main Timeline. However on all video files there is this horrible black effect that shows up when each clip starts playing, presumably as it loads(?), and goes away after 1-3 seconds when the colours all come in. Here's a picture of what it looks like:
It doesn't matter where I click on the video, that effect will start on where I start watching and stay for 1-3 seconds. This wouldn't be thaat much of an issue for editing but it sticks around during the render too which I can't have. Know how to fix it?