I am a SFM animator on YouTube. And today this morning I've encounterted a problem.

Details: All the videos are black on the preveiw screen, and none of clips have any signs of imagrey. In the "Project Media" seciton all the videos are there with an image in a random part of the video. In editing they're all blank. This is very recent, and I've never encountered this problem until now. All rendered videos from SFM use "qt7plug.dll"

What happend: I rendered an animation in SFM less than a second long at 60 FPS in the format MP4 Codec with a compression of H.264 at 1080p. Upon importing it in Sony Vegas Pro 13 the video was green, so I decided to close & re-open Vegas. And that's when the problem began. The animation I rendered in SFM was still green in Vegas, and it decided to break all the other videos along with it.

I really don't want to have to make an entirely new project just to fix this darn thing, and I certainly don't want to re-render, and animate every single scene for my animation again. I've looked up multiple ways to fix this problem on YouTube, but none of it specificly similar to my problem. I can promise you it's not my Video card, or my processor my PC is perfectly fine. This is all Sony Vegas's fault.

Note: I can not send screen shots of Vegas as I'm currently on a laptop, and my main PC has no internet as I'm at my online education atm.