Produced video is frozen, black, incomplete. I have tried to change the quality, tried producing, tried rendering timeline. Strange problem, always same result. I've deleted the resulting video/folder. I've shortened the video (10 seconds long only!) Changed resolution of video to make it smaller. I did an update to Camtasia, etc. Constantly a similar result. First 5 seconds the video is frozen, then a second of black, then last few seconds are fine.