I had a similar problem and for me, I had to reformat my MicroSD card and changes the Profiles to match Profile 4 under Audio and Video. I got it all up and running and then cut the power in my house to do some electrical work in the house. I then turned back on the power and tried to play the videos and got the black screen and I also noticed that the time stamp was all off again. So, i re-formatted the MicroSD Card and its working again.
Interesting to know that if someone breaks into my house, if they turn the power off and back on again, the video will be black.