I just found this thread in a search for a solution. Same issue here, I have a video that shows passwords and account numbers, and I'd like to blur them. So, my interim solution was to take the video, put it in Microsoft Video Editor to remove the audio first. Saved as an .mp4, and now I'm working with it in Storyline, where I will take a screenshot of an area I'd like to blur - blur it in SnagIt and copy it back over the top of that part of the video. Clunky solution, but ya gotta do what ya gotta do. Please light a fire under the developers on this one! Thanks!