Hi all, long-time lurker, first-time poster and all that...
Now, I know my workflow is all wrong, but I have an issue with videos I've 'letterboxed'. What I've done is manually 'squash' a 1280x720 video (by clicking on one of the four anchor points at each corner and pulling up), to create black space at the top and bottom.
Trouble is a blue line appears at the very top of the video (but not at the bottom, as you can see in the image), both in the preview and the exported video.
What can I do to get rid of this? Any help greatly appreciated.