user11489: After editing a video in Premiere Pro CC 2015 and then exporting it, a 1080p video becomes letter-boxed on the left and right sides. I have double checked all the settings, and for some reason it continues to letter box. 
Here is an example video to show you what I mean.

user11523: That can happen, when you use different Pixel aspect Ratio. Use Match Sequence Settings and use Pixel aspect Ratio in your sequence same with footage.

11489: <p>After editing a video in Premiere Pro CC 2015 and then exporting it, a 1080p video becomes letter-boxed on the left and right sides. I have double checked all the settings, and for some reason it continues to letter box. </p>

<p><a href="https://www.youtube.com/watch?v=leOeuSAEK5U" rel="nofollow">Here</a> is an example video to show you what I mean.</p>
 11523: <p>That can happen, when you use different Pixel aspect Ratio. Use Match Sequence Settings and use Pixel aspect Ratio in your sequence same with footage.</p>
