Produces a video with a black screen – Video Crop - Resize Video Review

I paid for this app. SUCH a waste of money!! Not only are there tons of ads but when I want to crop a video of the video it produces one with a black screen that lasts 20 seconds or whatever time I want it to. I’ve emailed them several times they have not fixed the issue. I want a refund.
Review by abluebook on Video Crop - Resize Video.