Black frames at end of render

I'm creating 10 second video loops for playback on a website. But when I export the video, it seems to be adding a black frame at the end of the render, so it skips when it loops.
I've created several of these videos just fine awhile back with the same file, and same preferences. The problem didn't start until I updated to CC 2014.
Anyone have any ideas? Am I just missing something in my render dialogue box?

Hi Cody,
cody_paulson wrote:
Thanks for the response, Kevin, I've tried this and it's not the problem. No matter where I mark the in or out—or even if I don't mark them at all—it still adds the black frame.
Now this is where things get interesting. The more I play with my export settings, I'm finding this only happens when I export with as H264. If I export as Quicktime, but with an H264 codec, it's fine.
I just did a test and there is no black frame on my export. Can you try again with a new project and different media?
Thanks,
Kevin

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