Ok: after putting the icon on the home screen I opened it and it brought up the camera app (with a black screen rather than an image). I hit home, it brought me to the home screen Nd then reopened the app and it was a black screen with the top bar (time, notifications, etc) being the only thing showing. After about 10 seconds it closed and went to the one screen. When I went to settings to stop the app, it wasn't on the list of running apps for me to stop. When I tried opening it again, my entire screen was black for about 20-30 seconds and then went back to the home screen.
Ok, I still need to know what happened when you tried the tricks from my previous posts in this thread...did you try a 3rd party camera app? If so what were the results, try at least 2 different free camera apps and let me know what occurred, it's the easier to narrow down the issue if it can be replicated across different apps...a factory reset is like walking blindfolded across a busy street-it works for some but not for others...it's better to replicate the issue on demand by narrowing down what isn't the problem so we can treat the problem directly-a factory reset may work but you will never know why it worked or if the problem will come back...