Help needed - Issues with Unity 5.1.1 - error messages & objects do a runner Thread

Hi Peeps

Im new to learning Unity 5.1.1 and using the following tutorial Unity3d.com

The following issues are happening:

1) Camera wont work after copy and pasting code

2) When I build the walls and save my project, they automatically delete / do a runner....aughhhhh

Q1) Has there been any known issues with Unity 5.1.1??

First of all, do you get any debuggin errors?

Did you try the camera without any code?
I can't find any code in your link?!